Shutdown PeerConnectionDependencyFactory before Blink shutdown

content/renderer/render_thread_impl.cc

 // 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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 877 matching lines @@
   if (devtools_agent_message_filter_.get()) {
     RemoveFilter(devtools_agent_message_filter_.get());
     devtools_agent_message_filter_ = nullptr;
   }
 
   RemoveFilter(audio_input_message_filter_.get());
   audio_input_message_filter_ = nullptr;
 
 #if defined(ENABLE_WEBRTC)
   RTCPeerConnectionHandler::DestructAllHandlers();
-  // |peer_connection_factory_| cannot be deleted until after the main message
-  // loop has been destroyed.  This is because there may be pending tasks that
-  // hold on to objects produced by the PC factory that depend on threads owned
-  // by the PC factory.  Once those tasks have been freed, the factory can be
-  // deleted.
+  peer_connection_factory_->ShutDown();
+  peer_connection_factory_ = nullptr;
 #endif
   RemoveFilter(vc_manager_->video_capture_message_filter());
   vc_manager_.reset();
 
   RemoveFilter(db_message_filter_.get());
   db_message_filter_ = nullptr;
 
   // Shutdown the file thread if it's running.
   if (file_thread_)
     file_thread_->Stop();
@@ skipping 1325 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content