Extend TWA location delegation histograms to 2021-06-30

Bug: 1149510
Change-Id: Ibeef73c084e059a0dca27bad2a8472e7f383452f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599897Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840257}

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

@@ -16540,7 +16540,7 @@ should be kept until we use this API.  -->
 </histogram>
 
 <histogram name="TrustedWebActivity.LocationDelegationEnrolled" enum="Boolean"
-    expires_after="2021-05-09">
+    expires_after="2021-06-30">
   <owner>eirage@chromium.org</owner>
   <owner>peconn@chromium.org</owner>
   <summary>
@@ -16551,7 +16551,7 @@ should be kept until we use this API.  -->
 </histogram>
 
 <histogram name="TrustedWebActivity.LocationPermissionChanged"
-    enum="TrustedWebActivityPermissionChanged" expires_after="2020-12-31">
+    enum="TrustedWebActivityPermissionChanged" expires_after="2021-06-30">
   <owner>eirage@chromium.org</owner>
   <owner>peconn@chromium.org</owner>
   <summary>
@@ -16561,7 +16561,7 @@ should be kept until we use this API.  -->
 </histogram>
 
 <histogram name="TrustedWebActivity.LocationPermissionRequestIsGranted"
-    enum="Boolean" expires_after="2020-12-31">
+    enum="Boolean" expires_after="2021-06-30">
   <owner>eirage@chromium.org</owner>
   <owner>peconn@chromium.org</owner>
   <summary>
@@ -16571,7 +16571,7 @@ should be kept until we use this API.  -->
 </histogram>
 
 <histogram name="TrustedWebActivity.LocationUpdateErrorCode"
-    enum="TrustedWebActivityLocationErrorCode" expires_after="2020-12-31">
+    enum="TrustedWebActivityLocationErrorCode" expires_after="2021-06-30">
   <owner>eirage@chromium.org</owner>
   <owner>peconn@chromium.org</owner>
   <summary>