[Signin]: Extend 'Profile.SyncCustomize' histogram.

Bug: 1089332
Change-Id: I6c699b26f1bb92126552e401f39993441e6d8283
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478986Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818441}

tools/metrics/histograms/histograms_xml/profile/histograms.xml

@@ -493,7 +493,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Profile.SyncCustomize" enum="ProfileSyncCustomize"
-    expires_after="M85">
+    expires_after="M92">
   <owner>msalama@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
   <summary>