Settings: Added new and changed incorrectly labelled histogram enums

The enum for the WebUI.Settings.PathVisited histogram recording the
visit count for each settings route had two major issues:
(1) Almost all of the site settings routes were labelled incorrectly
(2) It didn't include several recently added routes, in particular
    those added as part of the browser/OS settings split (bug 950007).

To deal with (1), I replaced all the incorrectly labelled site settings
routes with the correct labelling. Generally this meant appending the
string '/content' to the beginning of the label because the old label
ignored Route.createChild() method's handling of paths that do not
start with a slash [1] (the labels just added a slash at the beginning).

I dealt with (2) by searching as described in the bug [2] for a
comprehensive audit of relevant routes. The search turned up three
routes that I believe came from changes that have been migrated away:
(1) /help/management
(2) /manageAccessibility/tts/googleTtsEngine
(3) /parentalControls
Because there is little cost to adding a couple unused values, I added
them in Patchset 3 in case they are relevant for some edge case. If we
need. to remove them again, I can revert it to the state of the CL in
Patchset 2.

NOTE: The hashes came from following the instructions in [4], following
the approach of [5].

[1] https://cs.chromium.org/chromium/src/chrome/browser/resources/settings/route.js?rcl=9e4613082bd9a9972a6f5d21cb10f729fe1210bb&l=169
[2] https://bugs.chromium.org/p/chromium/issues/detail?id=952472#c9
[3] https://uma.googleplex.com/p/chrome/histograms/?sid=7c5a1f5262a2ec196167d4546f6448af
[4] https://gist.github.com/danbeam/d5fe7b1bcfebc9a94d60c9975b842e97
[5] https://chromium-review.googlesource.com/c/chromium/src/+/1089716/

Bug: 952472, 950007
Change-Id: Iea237f3f7285e520a3ed96f12abeed24911d653b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716215Reviewed-by: May Lippert <maybelle@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680534}

tools/metrics/histograms/enums.xml

@@ -61823,87 +61823,123 @@ Full version information for the fingerprint enum values:
 <enum name="WebUISettingsPathHashes">
   <int value="-2088016711" label="/startupPages"/>
   <int value="-2082028555" label="/androidApps/details"/>
-  <int value="-2081867874" label="/usbDevices"/>
   <int value="-2019732586" label="/printing"/>
+  <int value="-1950073287" label="/crostini/details"/>
   <int value="-1930329480" label="/signOut"/>
   <int value="-1924511305" label="/help"/>
-  <int value="-1915654604" label="/sound"/>
-  <int value="-1836863301" label="/ads"/>
   <int value="-1820397898" label="/manageAccessibility"/>
-  <int value="-1737559358" label="/flash"/>
+  <int value="-1795544471" label="/languages/inputMethods"/>
+  <int value="-1791818691" label="/content/camera"/>
+  <int value="-1732727903" label="/kerberosAccounts"/>
   <int value="-1688600161" label="/manageProfile"/>
+  <int value="-1675675685" label="/content/clipboard"/>
+  <int value="-1610814282" label="/content/popups"/>
+  <int value="-1575150353" label="/content/cookies"/>
   <int value="-1569772500" label="/manageAccessibility/tts"/>
-  <int value="-1351149930" label="/backgroundSync"/>
+  <int value="-1555301506" label="/content/notifications"/>
+  <int value="-1484929503" label="/manageAccessibility/switchAccess"/>
   <int value="-1312744606" label="/knownNetworks"/>
+  <int value="-1299234352" label="/pluginVm/details"/>
   <int value="-1297176639" label="/fonts"/>
+  <int value="-1283080115" label="/content/backgroundSync"/>
   <int value="-1279337432" label="/power"/>
   <int value="-1227595649" label="/all"/>
+  <int value="-1204780990" label="/dateTime/timeZone"/>
   <int value="-1167413307" label="/inputMethods"/>
   <int value="-1165810228" label="/searchEngines"/>
   <int value="-1119639824" label="/display"/>
+  <int value="-1068416040" label="/multidevice/features/smartLock"/>
   <int value="-1058065329" label="/languages"/>
   <int value="-1048015830" label="/"/>
-  <int value="-1024208058" label="/midiDevices"/>
-  <int value="-1021686484" label="/javascript"/>
+  <int value="-1028177121" label="/content/serialPorts"/>
+  <int value="-1007016915" label="/help/management"/>
   <int value="-1006445425" label="/importData"/>
   <int value="-988053194" label="/lockScreen"/>
   <int value="-972517930" label="/googleAssistant"/>
+  <int value="-940942794" label="/content/pdfDocuments"/>
   <int value="-916174295" label="/internet"/>
   <int value="-907780721" label="/certificates"/>
-  <int value="-843556233" label="/location"/>
-  <int value="-732448620" label="/pdfDocuments"/>
+  <int value="-898481268" label="/multidevice/features"/>
+  <int value="-842548379" label="/apps"/>
+  <int value="-809146474" label="/content/location"/>
+  <int value="-794215283" label="/content/images"/>
   <int value="-710357049" label="/bluetooth"/>
   <int value="-686834549" label="/downloads"/>
-  <int value="-536183569" label="/protectedContent"/>
+  <int value="-655433489" label="/payments"/>
+  <int value="-590688273" label="/content/sensors"/>
+  <int value="-570956986" label="/personalization"/>
   <int value="-512116630" label="/search"/>
   <int value="-482801316" label="/appearance"/>
   <int value="-469021167" label="/resetProfileSettings"/>
   <int value="-442978022" label="/networks"/>
+  <int value="-413956322" label="/content/zoomLevels"/>
   <int value="-378866134" label="/networkDetail"/>
+  <int value="-372127353" label="/content/paymentHandler"/>
+  <int value="-327540120" label="/content/javascript"/>
   <int value="-319293467" label="/multidevice"/>
   <int value="-300300075" label="/system"/>
+  <int value="-295702530" label="/smbShares"/>
+  <int value="-237154443" label="/manageAccessibility/tts/googleTtsEngine"/>
   <int value="-230959653" label="/syncSetup"/>
   <int value="-210069062" label="/content"/>
+  <int value="-189314307" label="/crostini/exportImport"/>
+  <int value="-152132510" label="/captions"/>
+  <int value="-146134264" label="/content/protectedContent"/>
+  <int value="-59332819" label="/accountManager"/>
   <int value="-44267040" label="/bluetoothDevices"/>
   <int value="-14666765" label="/accounts"/>
-  <int value="16194264" label="/popups"/>
-  <int value="48697687" label="/zoomLevels"/>
+  <int value="8030578" label="/crostini/sharedUsbDevices"/>
+  <int value="8530592" label="/syncSetup/advanced"/>
+  <int value="16287984" label="/languages/details"/>
+  <int value="60238454" label="/content/ads"/>
   <int value="223791833" label="/help/about"/>
   <int value="273561147" label="/autofill"/>
   <int value="297583680" label="/device"/>
-  <int value="306239043" label="/camera"/>
   <int value="334469894" label="/people"/>
   <int value="338873252" label="/passwords"/>
-  <int value="350639838" label="/cookies"/>
   <int value="408074355" label="/onStartup"/>
-  <int value="511430105" label="/automaticDownloads"/>
+  <int value="463749620" label="/content/flash"/>
   <int value="537677705" label="/cookies/detail"/>
+  <int value="547337090" label="/content/automaticDownloads"/>
+  <int value="614423407" label="/incompatibleApplications"/>
   <int value="618530678" label="/advanced"/>
+  <int value="682420978" label="/content/bluetoothScanning"/>
   <int value="683177973" label="/cupsPrinters"/>
   <int value="754547746" label="/help/details"/>
   <int value="856943564" label="/content/siteDetails"/>
   <int value="868952532" label="/pointer-overlay"/>
+  <int value="872535792" label="/parentalControls"/>
+  <int value="900733129" label="/content/microphone"/>
   <int value="912274271" label="/siteData"/>
   <int value="943458628" label="/triggeredResetProfileSettings"/>
+  <int value="1001064152" label="/pluginVm"/>
+  <int value="1051104480" label="/cleanup"/>
   <int value="1114615837" label="/accessibility"/>
   <int value="1147116633" label="/networkConfig"/>
-  <int value="1220946500" label="/notifications"/>
+  <int value="1161126439" label="/content/midiDevices"/>
+  <int value="1225485397" label="/content/unsandboxedPlugins"/>
+  <int value="1258785570" label="/crostini/sharedPaths"/>
+  <int value="1289631391" label="/pluginVm/sharedPaths"/>
   <int value="1300569861" label="/keyboard-overlay"/>
   <int value="1364454971" label="/androidApps"/>
-  <int value="1383875055" label="/microphone"/>
   <int value="1384165448" label="/stylus"/>
   <int value="1462185522" label="/dateTime"/>
-  <int value="1497571989" label="/images"/>
+  <int value="1463148011" label="/securityKeys"/>
   <int value="1513138656" label="/passwordsAndForms"/>
   <int value="1602314362" label="/storage"/>
   <int value="1641570017" label="/defaultBrowser"/>
+  <int value="1643599659" label="/content/usbDevices"/>
   <int value="1661964813" label="/reset"/>
   <int value="1742260422" label="/cloudPrinters"/>
   <int value="1798082697" label="/handlers"/>
+  <int value="1799541633" label="/addresses"/>
+  <int value="1810385625" label="/crostini"/>
   <int value="1853516270" label="/lockScreen/fingerprint"/>
   <int value="1935584577" label="/clearBrowserData"/>
   <int value="1956464558" label="/changePicture"/>
-  <int value="2083843665" label="/unsandboxedPlugins"/>
+  <int value="2014923527" label="/storage/externalStoragePreferences"/>
+  <int value="2030415176" label="/files"/>
+  <int value="2037005918" label="/content/sound"/>
   <int value="2127311241" label="/editDictionary"/>
   <int value="2136150421" label="/content/all"/>
   <int value="2136345292" label="/privacy"/>