Unexpire InstanceID.GetToken metrics

We're planning to remove support for options when switching from GCM to
FCM and this API was the only user of this field. Unexpiring it so we
can have fresh metrics (the old data showed 0 usage).

Bug: 1148321
Change-Id: I223e80ba0e6e88d3e4344377aec988e1488f954d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534832Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827404}

tools/metrics/histograms/histograms_xml/extensions/histograms.xml

@@ -2293,8 +2293,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Extensions.InstanceID.GetToken.OptionsCount" units="options"
-    expires_after="2019-01-30">
+    expires_after="M91">
   <owner>peter@chromium.org</owner>
+  <owner>knollr@chromium.org</owner>
   <summary>
     The number of options provided to the GetToken request. Recorded when the
     extension has made a call to chrome.instanceID.getToken().

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

@@ -6966,8 +6966,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InstanceID.GetToken.OptionsCount" units="options"
-    expires_after="2019-01-30">
+    expires_after="M91">
   <owner>peter@chromium.org</owner>
+  <owner>knollr@chromium.org</owner>
   <summary>
     The number of options provided to the GetToken request. Recorded when the
     request has been received by the InstanceID instance.