Remove {,un}setPendingActivity from AudioContext.

Source/modules/webaudio/AudioContext.h

Index: Source/modules/webaudio/AudioContext.h
diff --git a/Source/modules/webaudio/AudioContext.h b/Source/modules/webaudio/AudioContext.h
index 415e2358bcdb8cdd6bdd9d9cb4906ce94afa114b..5fe579dfa8adf1334405816f859f0b20c6dfdb90 100644
--- a/Source/modules/webaudio/AudioContext.h
+++ b/Source/modules/webaudio/AudioContext.h
@@ -90,6 +90,7 @@ public:
 
     // Document notification
     virtual void stop() OVERRIDE FINAL;
+    virtual bool hasPendingActivity() const OVERRIDE;
 
     AudioDestinationNode* destination() { return m_destinationNode.get(); }
     size_t currentSampleFrame() const { return m_destinationNode->currentSampleFrame(); }
@@ -251,6 +252,7 @@ private:
     // We'd like to schedule only one stop action for them.
     bool m_isStopScheduled;
     static void stopDispatch(void* userData);
+    bool m_isCleared;
     void clear();
 
     void scheduleNodeDeletion();