Extend Sync.TrustedVault* histograms

Bug: 1130650
Change-Id: Icb7c11466a7b7fced2831584572c3433c50d7ccc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435108
Auto-Submit: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811372}

tools/metrics/histograms/histograms_xml/sync/histograms.xml

@@ -897,7 +897,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Sync.TrustedVaultAddKeysAttemptIsSuccessful" enum="Boolean"
-    expires_after="2020-11-01">
+    expires_after="2021-05-01">
   <owner>mmoskvitin@google.com</owner>
   <owner>mastiz@chromium.org</owner>
   <summary>
@@ -907,7 +907,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Sync.TrustedVaultErrorShownOnStartup" enum="Boolean"
-    expires_after="2020-11-01">
+    expires_after="2021-05-01">
   <owner>mmoskvitin@google.com</owner>
   <owner>mastiz@chromium.org</owner>
   <summary>
@@ -918,7 +918,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Sync.TrustedVaultFetchedKeysCount" units="keys"
-    expires_after="2020-11-01">
+    expires_after="2021-05-01">
   <owner>mmoskvitin@google.com</owner>
   <owner>mastiz@chromium.org</owner>
   <summary>
@@ -927,14 +927,14 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Sync.TrustedVaultFetchKeysAttempt"
-    enum="TrustedVaultFetchKeysAttempt" expires_after="2020-11-01">
+    enum="TrustedVaultFetchKeysAttempt" expires_after="2021-05-01">
   <owner>mmoskvitin@google.com</owner>
   <owner>mastiz@chromium.org</owner>
   <summary>Recorded when fetching trusted vault keys is attempted.</summary>
 </histogram>
 
 <histogram name="Sync.TrustedVaultKeyRetrievalTrigger"
-    enum="TrustedVaultKeyRetrievalTrigger" expires_after="2020-11-01">
+    enum="TrustedVaultKeyRetrievalTrigger" expires_after="2021-05-01">
   <owner>mmoskvitin@google.com</owner>
   <owner>mastiz@chromium.org</owner>
   <summary>