Deprecate Net.QuicSession.PublicResetAddressMismatch which is not in use due...

Deprecate Net.QuicSession.PublicResetAddressMismatch which is not in use due to https://codereview.chromium.org/294823002.

Change-Id: I9c51936f69fde5abd6b60de9ab1614607213f97a
Reviewed-on: https://chromium-review.googlesource.com/942239Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540347}

tools/metrics/histograms/histograms.xml

@@ -47412,6 +47412,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Net.QuicSession.PublicResetAddressMismatch"
     enum="QuicAddressMismatch">
+  <obsolete>
+    Deprecated 02/2018. Use Net.QuicSession.PublicResetAddressMismatch2.
+  </obsolete>
   <owner>wtc@chromium.org</owner>
   <summary>
     When a public reset packet is received, whether the client IP address and