Delay the expiry of MediaRouter.Cast.LaunchSessionResponse.AppType

The metric is still being monitored for changes over time, so delay it by a year.

Bug: 1357696
Change-Id: Ic6a1b4c27a6a88efd74fa4649eed00c7c69d4b5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3930091
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Quick-Run: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Muyao Xu <muyaoxu@google.com>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1057850}

tools/metrics/histograms/metadata/media/histograms.xml

diff --git a/tools/metrics/histograms/metadata/media/histograms.xml b/tools/metrics/histograms/metadata/media/histograms.xml
index 8cf9725..5d926f4f 100644
--- a/tools/metrics/histograms/metadata/media/histograms.xml
+++ b/tools/metrics/histograms/metadata/media/histograms.xml
@@ -6078,7 +6078,7 @@
 </histogram>
 
 <histogram name="MediaRouter.Cast.LaunchSessionResponse.AppType"
-    enum="MediaRouterResponseReceiverAppType" expires_after="2022-10-09">
+    enum="MediaRouterResponseReceiverAppType" expires_after="2023-10-01">
   <owner>muyaoxu@google.com</owner>
   <owner>openscreen-eng@google.com</owner>
   <summary>