Stop using nested message loop for alert() and other JS dialogs

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 fdba7c596ae48e0f141bcbae111a34a971994741..6bc0bcc62147d839e2837f8be08589759ff67f20 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -662,7 +662,6 @@ void RenderThreadImpl::Init(
   InitializeWebKit(resource_task_queue);
 
   // In single process the single process is all there is.
-  notify_webkit_of_modal_loop_ = true;
   webkit_shared_timer_suspended_ = false;
   widget_count_ = 0;
   hidden_widget_count_ = 0;
@@ -1007,22 +1006,15 @@ bool RenderThreadImpl::Send(IPC::Message* msg) {
     }
   }
 
-  bool notify_webkit_of_modal_loop = true;  // default value
-  std::swap(notify_webkit_of_modal_loop, notify_webkit_of_modal_loop_);
-
   if (pumping_events) {
     renderer_scheduler_->SuspendTimerQueue();
-
-    if (notify_webkit_of_modal_loop)
-      WebView::willEnterModalLoop();
+    WebView::willEnterModalLoop();
   }
 
   bool rv = ChildThreadImpl::Send(msg);
 
   if (pumping_events) {
-    if (notify_webkit_of_modal_loop)
-      WebView::didExitModalLoop();
-
+    WebView::didExitModalLoop();
     renderer_scheduler_->ResumeTimerQueue();
   }
 
@@ -1677,10 +1669,6 @@ std::unique_ptr<base::SharedMemory> RenderThreadImpl::AllocateSharedMemory(
   return HostAllocateSharedMemoryBuffer(size);
 }
 
-void RenderThreadImpl::DoNotNotifyWebKitOfModalLoop() {
-  notify_webkit_of_modal_loop_ = false;
-}
-
 bool RenderThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
   base::ObserverListBase<RenderThreadObserver>::Iterator it(&observers_);
   RenderThreadObserver* observer;