cc: Remove AccelContentPaintDurationMS and related histos.

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 d9f88bf79c33967ef226bce8c7f3ae866114637e..b12be7f7f289b78f42f4996f7dbd50636023ea50 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -21238,7 +21238,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Renderer4.AccelContentPaintDurationMS">
-  <owner>wiltzius@chromium.org</owner>

[Alexei Svitkine (slow), 2014/05/13 14:50:35]

Nit: Actually, can you keep the existing owner tag like you do for
Renderer4.AccelContentPaintMegapixPerSecond?

I think our tools require it to be there.

+  <obsolete>
+    Deprecated 2014-05 because of impl-side painting.
+  </obsolete>
   <summary>
     Time spent by WebKit painting the page, in milliseconds, when the GPU
     acceleration is active, for paints that affect non-root layers.
@@ -21246,6 +21248,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="Renderer4.AccelContentPaintMegapixPerSecond">
+  <obsolete>
+    Deprecated 2014-05 because of impl-side painting.
+  </obsolete>
   <owner>wiltzius@chromium.org</owner>
   <summary>
     WebKit paint throughput, measured in megapixels per second, when GPU