Keep AudioScheduledSourceNode alive until onended is called.

Source/modules/webaudio/OscillatorNode.idl

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 // OscillatorNode is an audio generator of periodic waveforms.
 [
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    ActiveDOMObject
 ] interface OscillatorNode : AudioSourceNode {
 
     // Type constants.
     const unsigned short SINE = 0;
     const unsigned short SQUARE = 1;
     const unsigned short SAWTOOTH = 2;
     const unsigned short TRIANGLE = 3;
     const unsigned short CUSTOM = 4;
 
     [CustomSetter] attribute DOMString type;
 
     // Playback state constants.
     const unsigned short UNSCHEDULED_STATE = 0;
     const unsigned short SCHEDULED_STATE = 1;
     const unsigned short PLAYING_STATE = 2;
     const unsigned short FINISHED_STATE = 3;
 
     readonly attribute unsigned short playbackState;
 
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents
 
     void start(double when);
-    void stop(double when);
+    [ImplementedAs=stopNote] void stop(double when);
 
     void noteOn(double when);
     void noteOff(double when);
 
     void setPeriodicWave(PeriodicWave periodicWave);
 
     attribute EventHandler onended;
 };