Changed raw pointer to WeakPtr to prevent use-after-free on destruction.

content/browser/renderer_host/media/peer_connection_tracker_host.cc

 // 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.
 #include "content/browser/renderer_host/media/peer_connection_tracker_host.h"
 
 #include "base/power_monitor/power_monitor.h"
 #include "content/browser/media/webrtc/webrtc_eventlog_host.h"
 #include "content/browser/media/webrtc/webrtc_internals.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/common/media/peer_connection_tracker_messages.h"
 
 namespace content {
 
 PeerConnectionTrackerHost::PeerConnectionTrackerHost(
     int render_process_id,
-    WebRTCEventLogHost* event_log_host)
+    const base::WeakPtr<WebRTCEventLogHost>& event_log_host)
     : BrowserMessageFilter(PeerConnectionTrackerMsgStart),
       render_process_id_(render_process_id),
       event_log_host_(event_log_host) {
   DCHECK(event_log_host);
 }
 
 bool PeerConnectionTrackerHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
 
   IPC_BEGIN_MESSAGE_MAP(PeerConnectionTrackerHost, message)
@@ skipping 42 matching lines @@
 
 void PeerConnectionTrackerHost::OnAddPeerConnection(
     const PeerConnectionInfo& info) {
   WebRTCInternals::GetInstance()->OnAddPeerConnection(
       render_process_id_,
       peer_pid(),
       info.lid,
       info.url,
       info.rtc_configuration,
       info.constraints);
-  event_log_host_->PeerConnectionAdded(info.lid);
+  if (event_log_host_)
+    event_log_host_->PeerConnectionAdded(info.lid);
 }
 
 void PeerConnectionTrackerHost::OnRemovePeerConnection(int lid) {
   WebRTCInternals::GetInstance()->OnRemovePeerConnection(peer_pid(), lid);
-  event_log_host_->PeerConnectionRemoved(lid);
+  if (event_log_host_)
+    event_log_host_->PeerConnectionRemoved(lid);
 }
 
 void PeerConnectionTrackerHost::OnUpdatePeerConnection(
     int lid, const std::string& type, const std::string& value) {
   WebRTCInternals::GetInstance()->OnUpdatePeerConnection(
       peer_pid(),
       lid,
       type,
       value);
 }
@@ skipping 25 matching lines @@
 
 void PeerConnectionTrackerHost::SendOnSuspendOnUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   content::RenderProcessHost* host =
       content::RenderProcessHost::FromID(render_process_id_);
   if (host)
     host->Send(new PeerConnectionTracker_OnSuspend());
 }
 
 }  // namespace content