cc: Switch RenderingStats collection in Layer::Update() to RenderingStatsInstrumentation

cc/debug/rendering_stats_instrumentation.cc

Index: cc/debug/rendering_stats_instrumentation.cc
diff --git a/cc/debug/rendering_stats_instrumentation.cc b/cc/debug/rendering_stats_instrumentation.cc
index f19daaef38019de8a140a0fbd102c3a7c24b63ae..b1968f3a51305fcecfe83e87ecf26f95a4066aad 100644
--- a/cc/debug/rendering_stats_instrumentation.cc
+++ b/cc/debug/rendering_stats_instrumentation.cc
@@ -36,14 +36,6 @@ base::TimeDelta RenderingStatsInstrumentation::EndRecording(
   return base::TimeDelta();
 }
 
-void RenderingStatsInstrumentation::AddStats(const RenderingStats& other) {
-  if (!record_rendering_stats_)
-    return;
-
-  base::AutoLock scoped_lock(lock_);
-  rendering_stats_.Add(other);
-}
-
 void RenderingStatsInstrumentation::IncrementAnimationFrameCount() {
   if (!record_rendering_stats_)
     return;