Allow PeerConnection to be garbage collected after close().

Source/modules/mediastream/RTCDataChannel.h

Index: Source/modules/mediastream/RTCDataChannel.h
diff --git a/Source/modules/mediastream/RTCDataChannel.h b/Source/modules/mediastream/RTCDataChannel.h
index 8cd17b7b7034a3c878273012e3463aa72d3c2af7..42946d66d6e68344e00bb88fa02c764f956b7dab 100644
--- a/Source/modules/mediastream/RTCDataChannel.h
+++ b/Source/modules/mediastream/RTCDataChannel.h
@@ -43,13 +43,14 @@ namespace WebCore {
 
 class Blob;
 class ExceptionState;
+class RTCPeerConnection;
 
 class RTCDataChannel FINAL : public RefCountedWillBeRefCountedGarbageCollected<RTCDataChannel>, public ScriptWrappable, public EventTargetWithInlineData, public blink::WebRTCDataChannelHandlerClient {
     REFCOUNTED_EVENT_TARGET(RTCDataChannel);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RTCDataChannel);
 public:
-    static PassRefPtrWillBeRawPtr<RTCDataChannel> create(ExecutionContext*, PassOwnPtr<blink::WebRTCDataChannelHandler>);
-    static PassRefPtrWillBeRawPtr<RTCDataChannel> create(ExecutionContext*, blink::WebRTCPeerConnectionHandler*, const String& label, const blink::WebRTCDataChannelInit&, ExceptionState&);
+    static PassRefPtrWillBeRawPtr<RTCDataChannel> create(ExecutionContext*, WeakPtrWillBeRawPtr<RTCPeerConnection>, PassOwnPtr<blink::WebRTCDataChannelHandler>);
+    static PassRefPtrWillBeRawPtr<RTCDataChannel> create(ExecutionContext*, WeakPtrWillBeRawPtr<RTCPeerConnection>, blink::WebRTCPeerConnectionHandler*, const String& label, const blink::WebRTCDataChannelInit&, ExceptionState&);
     virtual ~RTCDataChannel();
 
     String label() const;
@@ -90,7 +91,7 @@ public:
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
-    RTCDataChannel(ExecutionContext*, PassOwnPtr<blink::WebRTCDataChannelHandler>);
+    RTCDataChannel(ExecutionContext*, WeakPtrWillBeRawPtr<RTCPeerConnection>, PassOwnPtr<blink::WebRTCDataChannelHandler>);
 
     void scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event>);
     void scheduledEventTimerFired(Timer<RTCDataChannel>*);
@@ -103,6 +104,8 @@ private:
     virtual void didReceiveRawData(const char*, size_t) OVERRIDE;
     virtual void didDetectError() OVERRIDE;
 
+    void stopAndFireCloseEventIfCreatorWasDeleted();
+
     OwnPtr<blink::WebRTCDataChannelHandler> m_handler;
 
     bool m_stopped;
@@ -117,6 +120,8 @@ private:
 
     Timer<RTCDataChannel> m_scheduledEventTimer;
     WillBeHeapVector<RefPtrWillBeMember<Event> > m_scheduledEvents;
+
+    WeakPtrWillBeWeakMember<RTCPeerConnection> m_creator;
 };
 
 } // namespace WebCore