Revert of Stop shutting down the message loop when the renderer stops (patchset #1 id:1 of https://…

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 c0f7350b4eb726b64533079fe58c5819e1fa53c5..7788e23d39496274d0f03de72922196351b52f2b 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -967,6 +967,11 @@ void RenderThreadImpl::Shutdown() {
 
   ChildThreadImpl::ShutdownDiscardableSharedMemoryManager();
 
+  if (main_message_loop_)
+    base::RunLoop().RunUntilIdle();
+
+  main_message_loop_.reset();
+
   lazy_tls.Pointer()->Set(nullptr);
 }