Mark UI.CompositorResizeLock.* histograms obsolete.

CompositorResizeLock was deleted in https://crrev.com/c/1053588.
UI.CompositorResizeLock.* hasn't been recorded since then so mark as
obsolete.

Bug: 928497
Change-Id: Idcb1473864f9342d797942f1b749ae587c1b2213
Reviewed-on: https://chromium-review.googlesource.com/c/1454222
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629981}
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 9a35d811..3aea757 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -120056,8 +120056,10 @@
   <summary>Whether a scroll is executed on main thread.</summary>
 </histogram>
 
-<histogram name="UI.CompositorResizeLock.Duration" units="ms"
-    expires_after="2019-01-30">
+<histogram name="UI.CompositorResizeLock.Duration" units="ms">
+  <obsolete>
+    Removed in M65.
+  </obsolete>
   <owner>kylechar@chromium.org</owner>
   <summary>
     The amount of time the CompositorResizeLock was held in milliseconds. This
@@ -120066,8 +120068,10 @@
   </summary>
 </histogram>
 
-<histogram name="UI.CompositorResizeLock.TimedOut" units="Boolean"
-    expires_after="2019-01-30">
+<histogram name="UI.CompositorResizeLock.TimedOut" units="Boolean">
+  <obsolete>
+    Removed in M65.
+  </obsolete>
   <owner>kylechar@chromium.org</owner>
   <summary>
     Tracks whether the CompositorResizeLock is being released due to timing out