Remove PageLoad.Timing2.NavigationToCommit histograms.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 9d00901a8d18cb0f51b705b2daf771e47e753501..69b09b89fae107461937edd69087a569458c0d57 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40525,6 +40525,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="PageLoad.Internal.CommitToComplete.NoTimingIPCs" units="ms">
+  <obsolete>
+    Deprecated on 10/14/2016. No longer needed.
+  </obsolete>
   <owner>bmcquade@chromium.org</owner>
   <summary>
     The delay between commit and completion, for page loads that did not receive
@@ -40793,6 +40796,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="PageLoad.Timing2.NavigationToCommit" units="ms">
+  <obsolete>
+    Deprecated in favor of PageLoad.ParseTiming.NavigationToParseStart
+  </obsolete>
   <owner>bmcquade@chromium.org</owner>
   <owner>csharrison@chromium.org</owner>
   <summary>