cc: Remove main thread rendering stats

cc/debug/benchmark_instrumentation.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_DEBUG_BENCHMARK_INSTRUMENTATION_H_
 #define CC_DEBUG_BENCHMARK_INSTRUMENTATION_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/debug/rendering_stats.h"
 
@@ skipping 24 matching lines @@
   ~ScopedBeginFrameTask() {
     TRACE_EVENT_END0(internal::kCategory, event_name_);
   }
 
  private:
   const char* event_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedBeginFrameTask);
 };
 
-void IssueMainThreadRenderingStatsEvent(
-    const RenderingStats::MainThreadRenderingStats& stats);
-void IssueImplThreadRenderingStatsEvent(
-    const RenderingStats::ImplThreadRenderingStats& stats);
+void IssueImplThreadRenderingStatsEvent(const RenderingStats& stats);
 void CC_EXPORT IssueDisplayRenderingStatsEvent();
 
 }  // namespace benchmark_instrumentation
 }  // namespace cc
 
 #endif  // CC_DEBUG_BENCHMARK_INSTRUMENTATION_H_