Update expiry date of IOS.ContentExtension.Index and IOS.ShareExtension.*

Fixed: 1147714, 1147717

Change-Id: I067f651bdfaaf9459c9321fa9238d18f816d0bdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534792Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Auto-Submit: Javier Flores <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826972}

tools/metrics/histograms/histograms_xml/ios/histograms.xml

@@ -61,7 +61,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="IOS.ContentExtension.Index" units="index"
-    expires_after="2020-12-25">
+    expires_after="2021-11-01">
   <owner>javierrobles@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>
@@ -701,7 +701,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="IOS.ShareExtension.ReceivedEntriesCount" units="files"
-    expires_after="2020-12-25">
+    expires_after="2021-11-01">
   <owner>javierrobles@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>
@@ -711,14 +711,14 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="IOS.ShareExtension.ReceivedEntry"
-    enum="IOSShareExtensionReceivedEntryType" expires_after="2020-12-25">
+    enum="IOSShareExtensionReceivedEntryType" expires_after="2021-11-01">
   <owner>javierrobles@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>Type of the item received from the iOS share extension.</summary>
 </histogram>
 
 <histogram name="IOS.ShareExtension.ReceivedEntryDelay" units="ms"
-    expires_after="2020-12-25">
+    expires_after="2021-11-01">
   <owner>javierrobles@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>
@@ -728,7 +728,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="IOS.ShareExtension.Source"
-    enum="IOSShareExtensionReceivedEntrySource" expires_after="2020-12-25">
+    enum="IOSShareExtensionReceivedEntrySource" expires_after="2021-11-01">
   <owner>javierrobles@chromium.org</owner>
   <owner>olivierrobin@chromium.org</owner>
   <summary>