Fix issue of localDescription and remoteDescription getter.

Source/modules/mediastream/RTCPeerConnection.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 53 matching lines @@
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RTCPeerConnection);
 public:
     static RTCPeerConnection* create(ExecutionContext*, const Dictionary&, const Dictionary&, ExceptionState&);
     virtual ~RTCPeerConnection();
 
     void createOffer(RTCSessionDescriptionCallback*, RTCErrorCallback*, const Dictionary&, ExceptionState&);
 
     void createAnswer(RTCSessionDescriptionCallback*, RTCErrorCallback*, const Dictionary&, ExceptionState&);
 
     void setLocalDescription(RTCSessionDescription*, VoidCallback*, RTCErrorCallback*, ExceptionState&);
-    RTCSessionDescription* localDescription(ExceptionState&);
+    RTCSessionDescription* localDescription();
 
     void setRemoteDescription(RTCSessionDescription*, VoidCallback*, RTCErrorCallback*, ExceptionState&);
-    RTCSessionDescription* remoteDescription(ExceptionState&);
+    RTCSessionDescription* remoteDescription();
 
     String signalingState() const;
 
     void updateIce(const Dictionary& rtcConfiguration, const Dictionary& mediaConstraints, ExceptionState&);
 
     // DEPRECATED
     void addIceCandidate(RTCIceCandidate*, ExceptionState&);
 
     void addIceCandidate(RTCIceCandidate*, VoidCallback*, RTCErrorCallback*, ExceptionState&);
 
@@ skipping 69 matching lines @@
     void scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event>);
     void dispatchScheduledEvent();
     bool hasLocalStreamWithTrackId(const String& trackId);
 
     void changeSignalingState(WebRTCPeerConnectionHandlerClient::SignalingState);
     void changeIceGatheringState(WebRTCPeerConnectionHandlerClient::ICEGatheringState);
     void changeIceConnectionState(WebRTCPeerConnectionHandlerClient::ICEConnectionState);
 
     void closeInternal();
 
+    Member<RTCSessionDescription> m_localDescription;
+    Member<RTCSessionDescription> m_remoteDescription;
     SignalingState m_signalingState;
     ICEGatheringState m_iceGatheringState;
     ICEConnectionState m_iceConnectionState;
 
     MediaStreamVector m_localStreams;
     MediaStreamVector m_remoteStreams;
 
     HeapVector<Member<RTCDataChannel>> m_dataChannels;
 
     OwnPtr<WebRTCPeerConnectionHandler> m_peerHandler;
 
     AsyncMethodRunner<RTCPeerConnection> m_dispatchScheduledEventRunner;
     WillBeHeapVector<RefPtrWillBeMember<Event>> m_scheduledEvents;
 
     bool m_stopped;
     bool m_closed;
 };
 
 } // namespace blink
 
 #endif // RTCPeerConnection_h