Extend AtomicPolicyGroups histograms to 2021-11-01

Extended the Enterprise.Policies.SourceConflicts and
Enterprise.Policies.IgnoredByPolicyGroup histograms.

Bug: 1084092, 1125834
Change-Id: I113b93ae2c452a63fb77d31e4dfe9b06fda40b0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508261
Auto-Submit: Yann Dago <ydago@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823604}

tools/metrics/histograms/histograms_xml/enterprise/histograms.xml

@@ -971,8 +971,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Enterprise.Policies.IgnoredByPolicyGroup"
-    enum="EnterprisePolicies" expires_after="2020-10-18">
+    enum="EnterprisePolicies" expires_after="2021-11-01">
   <owner>ydago@chromium.org</owner>
+  <owner>pastarmovj@chromium.org</owner>
   <summary>
     A set of enterprise policy rules that are ignored because they do not share
     the highest priority from their policy atomic group. This is recorded at
@@ -982,8 +983,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Enterprise.Policies.SourceConflicts" enum="PolicyAtomicGroups"
-    expires_after="2020-07-01">
+    expires_after="2021-11-01">
   <owner>ydago@chromium.org</owner>
+  <owner>pastarmovj@chromium.org</owner>
   <summary>
     A set of policy atomic groups that have at least one policy disabled because
     of its source. This is recorded at startup, then every 24 hours. If chrome