cc: Remove unused metrics from RenderingStats.

cc/resources/picture.h

Index: cc/resources/picture.h
diff --git a/cc/resources/picture.h b/cc/resources/picture.h
index 6a33a40f5aed04c941a1a92ff44cef1ab0f05920..86e34b383f7e894301e62b36bd8169734c285eea 100644
--- a/cc/resources/picture.h
+++ b/cc/resources/picture.h
@@ -34,7 +34,6 @@ class AnalysisCanvas;
 namespace cc {
 
 class ContentLayerClient;
-class RenderingStatsInstrumentation;
 
 class CC_EXPORT Picture
     : public base::RefCountedThreadSafe<Picture> {
@@ -63,8 +62,7 @@ class CC_EXPORT Picture
               const SkTileGridPicture::TileGridInfo& tile_grid_info);
 
   // Gather pixel refs from recording.
-  void GatherPixelRefs(const SkTileGridPicture::TileGridInfo& tile_grid_info,
-                       RenderingStatsInstrumentation* stats_instrumentation);
+  void GatherPixelRefs(const SkTileGridPicture::TileGridInfo& tile_grid_info);
 
   // Has Record() been called yet?
   bool HasRecording() const { return picture_.get() != NULL; }