Destroy all rtc peer connection handlers before shutting down blink

content/renderer/media/rtc_peer_connection_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 70 matching lines @@
 // the main render thread.
 class CONTENT_EXPORT RTCPeerConnectionHandler
     : NON_EXPORTED_BASE(public blink::WebRTCPeerConnectionHandler),
       NON_EXPORTED_BASE(public webrtc::PeerConnectionObserver) {
  public:
   RTCPeerConnectionHandler(
       blink::WebRTCPeerConnectionHandlerClient* client,
       PeerConnectionDependencyFactory* dependency_factory);
   virtual ~RTCPeerConnectionHandler();
 
+  // Destroy all existing RTCPeerConnectionHandler objects.
+  static void DestructAllHandlers();
+
   void associateWithFrame(blink::WebFrame* frame);
 
   // Initialize method only used for unit test.
   bool InitializeForTest(
       const blink::WebRTCConfiguration& server_configuration,
       const blink::WebMediaConstraints& options,
       PeerConnectionTracker* peer_connection_tracker);
 
   // blink::WebRTCPeerConnectionHandler implementation
   virtual bool initialize(
@@ skipping 108 matching lines @@
       content::RemoteMediaStreamImpl*> RemoteStreamMap;
   RemoteStreamMap remote_streams_;
   scoped_refptr<webrtc::UMAObserver> uma_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCPeerConnectionHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_PEER_CONNECTION_HANDLER_H_