Use WeakPtr for RTCPeerConnectionHandler and RTCPeerConnectionTracker.

content/renderer/media/peer_connection_tracker.h

 // Copyright (c) 2013 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_PEERCONNECTION_TRACKER_H_
 #define CONTENT_RENDERER_MEDIA_PEERCONNECTION_TRACKER_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "content/public/renderer/render_process_observer.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebRTCPeerConnectionHandlerClient.h"
 #include "third_party/WebKit/public/platform/WebRTCSessionDescription.h"
 #include "third_party/libjingle/source/talk/app/webrtc/peerconnectioninterface.h"
 
 namespace blink {
 class WebFrame;
 class WebRTCICECandidate;
 class WebString;
 class WebRTCSessionDescription;
 class WebUserMediaRequest;
 }  // namespace blink
 
 namespace webrtc {
 class DataChannelInterface;
 }  // namespace webrtc
 
 namespace content {
 class RTCMediaConstraints;
 class RTCPeerConnectionHandler;
 
 // This class collects data about each peer connection,
 // sends it to the browser process, and handles messages
 // from the browser process.
-class CONTENT_EXPORT PeerConnectionTracker : public RenderProcessObserver {
+class CONTENT_EXPORT PeerConnectionTracker
+    : public RenderProcessObserver,
+      public base::SupportsWeakPtr<PeerConnectionTracker> {
  public:
   PeerConnectionTracker();
   ~PeerConnectionTracker() override;
 
   enum Source {
     SOURCE_LOCAL,
     SOURCE_REMOTE
   };
 
   enum Action {
@@ skipping 130 matching lines @@
   // This keeps track of the next available local ID.
   int next_lid_;
   base::ThreadChecker main_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(PeerConnectionTracker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_PEERCONNECTION_TRACKER_H_