Delay expiry of histograms causing alerts.

Updates the expires_after attribute for 21 histograms that have
been used to generate alerts in the past 90 days and do not already have
a date later than or within 60 days of 2021-04-05.

TBR=chromium-metrics-reviews@google.com

Change-Id: I11e1f8ba0d308fd6a68b83bb323142beefb33734
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611345Reviewed-by: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Commit-Queue: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Cr-Commit-Position: refs/heads/master@{#840241}

tools/metrics/histograms/histograms_xml/custom_tabs/histograms.xml

@@ -290,7 +290,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="CustomTabs.WarmupStateOnLaunch" enum="WarmupStateOnLaunch"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>lizeb@chromium.org</owner>
   <summary>
     Recorded only on Android. Reports whether warmup() has been called when a

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

@@ -1497,7 +1497,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Enterprise.VpdUpdateStatus" units="units"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>igorcov@chromium.org</owner>
   <owner>tnagel@chromium.org</owner>
   <summary>

tools/metrics/histograms/histograms_xml/media/histograms.xml

@@ -144,7 +144,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Media.Audio.Capture.FramesProvided" units="frames"
-    expires_after="2021-04-04">
+    expires_after="2021-07-04">
   <owner>guidou@chromium.org</owner>
   <owner>armax@chromium.org</owner>
   <summary>

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

@@ -18064,7 +18064,7 @@ regressions. -->
 </histogram>
 
 <histogram name="WebFont.HadBlankText" enum="BooleanHadBlankText"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>kenjibaheux@chromium.org</owner>
   <owner>ksakamoto@chromium.org</owner>
   <summary>

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

@@ -1080,7 +1080,7 @@ can be compared for the same population). -->
 </histogram>
 
 <histogram name="Sync.URLFetchResponse"
-    enum="CombinedHttpResponseAndNetErrorCode" expires_after="2021-05-02">
+    enum="CombinedHttpResponseAndNetErrorCode" expires_after="2021-07-04">
   <owner>mastiz@chromium.org</owner>
   <owner>treib@chromium.org</owner>
   <summary>

tools/metrics/histograms/histograms_xml/ukm/histograms.xml

@@ -92,7 +92,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="UKM.Entries.Recorded.ByEntryHash" enum="UkmEventNameHash"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>yrsun@chromium.org</owner>
   <owner>ukm-team@google.com</owner>
   <summary>

tools/metrics/histograms/histograms_xml/v8/histograms.xml

@@ -1016,7 +1016,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="V8.WasmCompileModuleAsyncMicroSeconds" units="microseconds"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>ecmziegler@chromium.org</owner>
   <owner>adamk@chromium.org</owner>
   <owner>clemensb@chromium.org</owner>

tools/metrics/histograms/histograms_xml/web_rtc/histograms.xml

@@ -721,7 +721,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.Encoder.CodecType" enum="WebRtcAudioCodecs"
-    expires_after="2021-05-02">
+    expires_after="2021-07-04">
   <owner>aleloi@chromium.org</owner>
   <summary>
     Histogram of audio codec usage. Every sample corresponds to 5 seconds of