Extend expiration for SiteIsolation.OutOfProcess* metrics.

Fixed: 1301615
Change-Id: I8064c328243decfb3831fb7c5ec56c2a4c183566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3530007
Auto-Submit: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Chris Thompson <cthomp@chromium.org>
Commit-Queue: Chris Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/main@{#981986}
diff --git a/tools/metrics/histograms/metadata/security/histograms.xml b/tools/metrics/histograms/metadata/security/histograms.xml
index f53092e..d9ac4471 100644
--- a/tools/metrics/histograms/metadata/security/histograms.xml
+++ b/tools/metrics/histograms/metadata/security/histograms.xml
@@ -913,7 +913,7 @@
 </histogram>
 
 <histogram name="SiteIsolation.OutOfProcessIframes" units="oopifs"
-    expires_after="2022-08-14">
+    expires_after="2023-03-14">
   <owner>alexmos@chromium.org</owner>
   <owner>creis@chromium.org</owner>
   <owner>lukasza@chromium.org</owner>
@@ -924,7 +924,7 @@
 </histogram>
 
 <histogram name="SiteIsolation.OutOfProcessInnerFrameTrees" units="frame trees"
-    expires_after="2022-04-10">
+    expires_after="2023-03-14">
   <owner>alexmos@chromium.org</owner>
   <owner>creis@chromium.org</owner>
   <owner>lukasza@chromium.org</owner>