Remove Cloud Print preferences from incognito whitelist.

Cloud Print preferences are removed from the persistent storage list for
incognito mode.
After this CL, if these preferences are changed from incognito mode,
they are only stored in memory and won't affect user profile.

Bug: 861722
Change-Id: I601f41f611a81c2a5dccc712dba7f5e5626c923a
Reviewed-on: https://chromium-review.googlesource.com/1176810
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583821}

chrome/browser/prefs/pref_service_incognito_whitelist.cc

@@ -472,14 +472,7 @@ const char* const kTemporaryIncognitoWhitelist[] = {
     prefs::kDefaultAudioCaptureDevice, prefs::kDefaultVideoCaptureDevice,
     prefs::kMediaDeviceIdSalt, prefs::kMediaStorageIdSalt,
 
-    prefs::kPrintPreviewStickySettings, prefs::kCloudPrintRoot,
-    prefs::kCloudPrintProxyEnabled, prefs::kCloudPrintProxyId,
-    prefs::kCloudPrintAuthToken, prefs::kCloudPrintEmail,
-    prefs::kCloudPrintPrintSystemSettings, prefs::kCloudPrintEnableJobPoll,
-    prefs::kCloudPrintRobotRefreshToken, prefs::kCloudPrintRobotEmail,
-    prefs::kCloudPrintConnectNewPrinters, prefs::kCloudPrintXmppPingEnabled,
-    prefs::kCloudPrintXmppPingTimeout, prefs::kCloudPrintPrinters,
-    prefs::kCloudPrintSubmitEnabled, prefs::kCloudPrintUserSettings,
+    prefs::kPrintPreviewStickySettings,
 
     prefs::kMaxConnectionsPerProxy,