cc: Improve frame/commit accounting

cc/CCFrameRateCounter.h

Index: cc/CCFrameRateCounter.h
diff --git a/cc/CCFrameRateCounter.h b/cc/CCFrameRateCounter.h
index 76b42242565b74db6467aff88fc71c62796561e4..90a2bca29f87a354a5117c4ed7b2900f0cb39396 100644
--- a/cc/CCFrameRateCounter.h
+++ b/cc/CCFrameRateCounter.h
@@ -35,8 +35,6 @@ public:
     // true if the given frame interval is too fast or too slow, based on constant thresholds.
     bool isBadFrameInterval(double intervalBetweenConsecutiveFrames) const;
 
-    int droppedFrameCount() const { return m_droppedFrameCount; }
-
 private:
     CCFrameRateCounter();
 
@@ -60,8 +58,6 @@ private:
     int m_currentFrameNumber;
     double m_timeStampHistory[kTimeStampHistorySize];
 
-    int m_droppedFrameCount;
-
     DISALLOW_COPY_AND_ASSIGN(CCFrameRateCounter);
 };