cc: Remove unused metrics from RenderingStats.

cc/test/fake_picture_pile_impl.cc

Index: cc/test/fake_picture_pile_impl.cc
diff --git a/cc/test/fake_picture_pile_impl.cc b/cc/test/fake_picture_pile_impl.cc
index 01b481f87a3ce8832ba10eb2b624c5ffecd9bf04..03084ed7bef3913c668be42c82d4b7b52427586a 100644
--- a/cc/test/fake_picture_pile_impl.cc
+++ b/cc/test/fake_picture_pile_impl.cc
@@ -7,7 +7,6 @@
 #include <limits>
 #include <utility>
 
-#include "cc/test/fake_rendering_stats_instrumentation.h"
 #include "cc/test/impl_side_painting_settings.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -63,11 +62,9 @@ void FakePicturePileImpl::AddRecordingAt(int x, int y) {
   gfx::Rect bounds(tiling().TileBounds(x, y));
   bounds.Inset(-buffer_pixels(), -buffer_pixels());
 
-  FakeRenderingStatsInstrumentation stats_instrumentation;
-
   scoped_refptr<Picture> picture(Picture::Create(bounds));
   picture->Record(&client_, tile_grid_info_);
-  picture->GatherPixelRefs(tile_grid_info_, &stats_instrumentation);
+  picture->GatherPixelRefs(tile_grid_info_);
   picture_list_map_[std::pair<int, int>(x, y)].push_back(picture);
   EXPECT_TRUE(HasRecordingAt(x, y));