Destroy all rtc peer connection handlers before shutting down blink

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 93ec9cf006aed3766bccd2d4a64bc5b10911d860..730f621c7299706b6c119d75cabe45a12422e970 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -79,6 +79,7 @@
 #include "content/renderer/media/midi_message_filter.h"
 #include "content/renderer/media/peer_connection_tracker.h"
 #include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
+#include "content/renderer/media/rtc_peer_connection_handler.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/video_capture_message_filter.h"
 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
@@ -534,6 +535,8 @@ void RenderThreadImpl::Shutdown() {
   audio_message_filter_ = NULL;
 
 #if defined(ENABLE_WEBRTC)
+  RTCPeerConnectionHandler::DestructAllHandlers();
+
   peer_connection_factory_.reset();
 #endif
   RemoveFilter(vc_manager_->video_capture_message_filter());