Add victortan@chromium.org as histogram owner

And bump expiration a few months

Change-Id: I1ed96398f7749f7d936cde93d09b0a796801d5c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4347616
Auto-Submit: Mike Taylor <miketaylr@chromium.org>
Reviewed-by: Victor Tan <victortan@chromium.org>
Reviewed-by: Luc Nguyen <lucnguyen@google.com>
Commit-Queue: Luc Nguyen <lucnguyen@google.com>
Cr-Commit-Position: refs/heads/main@{#1119123}

tools/metrics/histograms/metadata/others/histograms.xml

@@ -2813,8 +2813,8 @@ chromium-metrics-reviews@google.com.
 </histogram>
 
 <histogram name="ClientHints.AcceptCHFrame" enum="AcceptCHFrameRestart"
-    expires_after="2023-08-20">
-  <owner>aarontag@chromium.org</owner>
+    expires_after="2023-10-31">
+  <owner>victortan@chromium.org</owner>
   <owner>miketaylr@chromium.org</owner>
   <summary>
     Emitted on two related events: First, when an request that is eligable to be
@@ -2825,8 +2825,8 @@ chromium-metrics-reviews@google.com.
 </histogram>
 
 <histogram name="ClientHints.CriticalCHRestart" enum="CriticalCHRestart"
-    expires_after="2023-08-20">
-  <owner>aarontag@chromium.org</owner>
+    expires_after="2023-10-31">
+  <owner>victortan@chromium.org</owner>
   <owner>miketaylr@chromium.org</owner>
   <summary>
     Count of requests restarted because of the Critical-CH response header.