Extend OAuth2Login histograms

Extend OAuth2Login.SessionRestoreTimeTo* and
OAuth2Login.PostMergeVerification/PreMergeVerification
histograms.

Bug: 1144817, 1138295
Change-Id: Id22d47526780d7d7afeea1cc57e782d8358c9b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601359Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840987}

tools/metrics/histograms/histograms_xml/others/histograms.xml

@@ -10560,7 +10560,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OAuth2Login.PostMergeVerification"
-    enum="PostMergeVerificationOutcome" expires_after="M88">
+    enum="PostMergeVerificationOutcome" expires_after="2021-06-17">
   <owner>droger@chromium.org</owner>
   <owner>msarda@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
@@ -10572,7 +10572,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OAuth2Login.PreMergeVerification"
-    enum="PostMergeVerificationOutcome" expires_after="M88">
+    enum="PostMergeVerificationOutcome" expires_after="2021-06-17">
   <owner>droger@chromium.org</owner>
   <owner>msarda@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
@@ -10592,7 +10592,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OAuth2Login.SessionRestoreTimeToFailure" units="ms"
-    expires_after="2020-12-17">
+    expires_after="2021-06-17">
   <owner>droger@chromium.org</owner>
   <owner>msarda@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
@@ -10600,7 +10600,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OAuth2Login.SessionRestoreTimeToSuccess" units="ms"
-    expires_after="2020-12-17">
+    expires_after="2021-06-17">
   <owner>droger@chromium.org</owner>
   <owner>msarda@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>