Add histogram owner for cookie DB loading.

These histograms are related to SQLite load times and
specifically the registry controlled domains.

TBR=asvitkine@chromium.org
BUG=370672
NOTRY=true

Review URL: https://codereview.chromium.org/470043002

Cr-Commit-Position: refs/heads/master@{#289466}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289466 0039d316-1c4b-4281-b951-d872f2087c98

tools/metrics/histograms/histograms.xml

@@ -3217,12 +3217,12 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Cookie.TimeInitializeDB" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>nyquist@chromium.org</owner>
   <summary>The amount of time (ms) to initialize the cookies database.</summary>
 </histogram>
 
 <histogram name="Cookie.TimeInitializeDomainMap" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>nyquist@chromium.org</owner>
   <summary>
     The amount of time (ms) to read and parse the domain map from the cookies
     database.
@@ -3254,14 +3254,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Cookie.TimeLoadDomains" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>nyquist@chromium.org</owner>
   <summary>
     The amount of time (ms) to read the domain map from the cookies database.
   </summary>
 </histogram>
 
 <histogram name="Cookie.TimeParseDomains" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>nyquist@chromium.org</owner>
   <summary>
     The amount of time (ms) to parse the domains already loaded from the cookies
     database and put them in the domain map.