Reorder AudioMessageFilter shutdown. Remove spammy DCHECK.

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 d6aa2743bc5c0e553da66e7b70ee3934740beb6f..20470088947c6054fbbadc96f30056c0e1094375 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -616,9 +616,6 @@ void RenderThreadImpl::Shutdown() {
   RemoveFilter(audio_input_message_filter_.get());
   audio_input_message_filter_ = NULL;
 
-  RemoveFilter(audio_message_filter_.get());
-  audio_message_filter_ = NULL;
-
 #if defined(ENABLE_WEBRTC)
   RTCPeerConnectionHandler::DestructAllHandlers();
 
@@ -640,6 +637,11 @@ void RenderThreadImpl::Shutdown() {
   }
 
   media_thread_.reset();
+
+  // AudioMessageFilter may be accessed on |media_thread_|, so shutdown after.
+  RemoveFilter(audio_message_filter_.get());
+  audio_message_filter_ = NULL;
+
   compositor_thread_.reset();
   input_handler_manager_.reset();
   if (input_event_filter_.get()) {