Remove OmahaUpdateInfoBar and related classes

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 b4d637fa8986b8c5ea82c7c4958fd14df0a2ec7a..704fd0939a7a97a92b7406eead4507095293b19b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -14772,6 +14772,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="GoogleUpdate.InfoBar.ActionTaken"
     enum="GoogleUpdateInfoBarActions">
+  <obsolete>
+    Deprecated 12/2015 in Issue 566085.
+  </obsolete>
   <owner>yfriedman@chromium.org</owner>
   <owner>dfalcantara@chromium.org</owner>
   <summary>
@@ -14781,6 +14784,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="GoogleUpdate.InfoBar.InternalStorageSizeAvailable" units="MB">

[Yaron, 2015/12/22 15:26:38]

Can you add this metric back to your new impl? We have reason to believe that a
non-trivial %-age of users can't update due to lack of space.

+  <obsolete>
+    Deprecated 12/2015 in Issue 566085.
+  </obsolete>
   <owner>yfriedman@chromium.org</owner>
   <owner>dfalcantara@chromium.org</owner>
   <owner>khushalsagar@chromium.org</owner>
@@ -14791,6 +14797,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="GoogleUpdate.InfoBar.TimeShown" units="milliseconds">
+  <obsolete>
+    Deprecated 12/2015 in Issue 566085.
+  </obsolete>
   <owner>yfriedman@chromium.org</owner>
   <owner>dfalcantara@chromium.org</owner>
   <summary>