Keep AudioScheduledSourceNode alive until onended is called.

Source/modules/webaudio/AudioScheduledSourceNode.h

Index: Source/modules/webaudio/AudioScheduledSourceNode.h
diff --git a/Source/modules/webaudio/AudioScheduledSourceNode.h b/Source/modules/webaudio/AudioScheduledSourceNode.h
index 552fa0e75180ea09a107136d7e38de2fff382a3f..296c6abf971b4bc421aeb1b3ba947aad6697ddc5 100644
--- a/Source/modules/webaudio/AudioScheduledSourceNode.h
+++ b/Source/modules/webaudio/AudioScheduledSourceNode.h
@@ -29,13 +29,14 @@
 #ifndef AudioScheduledSourceNode_h
 #define AudioScheduledSourceNode_h
 
+#include "core/dom/ActiveDOMObject.h"
 #include "modules/webaudio/AudioSourceNode.h"
 
 namespace WebCore {
 
 class AudioBus;
 
-class AudioScheduledSourceNode : public AudioSourceNode {
+class AudioScheduledSourceNode : public AudioSourceNode, public ActiveDOMObject {
 public:
     // These are the possible states an AudioScheduledSourceNode can be in:
     //
@@ -58,7 +59,7 @@ public:
 
     // Scheduling.
     void start(double when);
-    void stop(double when);
+    void stopNote(double when);
 
     void noteOn(double when);
     void noteOff(double when);
@@ -70,6 +71,9 @@ public:
     EventListener* onended(DOMWrapperWorld* isolatedWorld) { return getAttributeEventListener(eventNames().endedEvent, isolatedWorld); }
     void setOnended(PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);
 
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
+    virtual void stop() OVERRIDE;
+
 protected:
     // Get frame information for the current time quantum.
     // We handle the transition into PLAYING_STATE and FINISHED_STATE here,
@@ -100,6 +104,7 @@ protected:
     double m_endTime; // in seconds
 
     bool m_hasEndedListener;
+    bool m_notifyingEndedListener;
 
     static const double UnknownTime;
 };