Extend lifetime of compression histograms

Extend the lifetime of histograms
Blink.Compression.CompressionStream.Format and
Blink.Compression.DecompressionStream.Format. These aren't currently
needed, but will be needed again in future when we add more formats.

BUG=1158458,1158457

Change-Id: I9aa9ad94eb389a085e626750112ed5d7c319bac7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624275
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843027}

tools/metrics/histograms/histograms_xml/blink/histograms.xml

@@ -498,7 +498,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Blink.Compression.CompressionStream.Format"
-    enum="CompressionStreamsFormat" expires_after="2021-01-24">
+    enum="CompressionStreamsFormat" expires_after="2022-01-12">
   <owner>ricea@chromium.org</owner>
   <owner>yhirano@chromium.org</owner>
   <summary>
@@ -510,7 +510,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Blink.Compression.DecompressionStream.Format"
-    enum="CompressionStreamsFormat" expires_after="2021-01-24">
+    enum="CompressionStreamsFormat" expires_after="2022-01-12">
   <owner>ricea@chromium.org</owner>
   <owner>yhirano@chromium.org</owner>
   <summary>