Fix panels being removed from PanelManager prematurely.

content/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2011 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/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1149 matching lines @@
 
 void RenderViewHost::OnMsgShouldCloseACK(bool proceed) {
   StopHangMonitorTimeout();
   // If this renderer navigated while the beforeunload request was in flight, we
   // may have cleared this state in OnMsgNavigate, in which case we can ignore
   // this message.
   if (!is_waiting_for_beforeunload_ack_ || is_swapped_out_)
     return;
 
   is_waiting_for_beforeunload_ack_ = false;
+  content::NotificationService::current()->Notify(
+      content::NOTIFICATION_RENDER_VIEW_HOST_RECEIVED_ON_MSG_SHOULD_CLOSE_ACK,
+      content::Source<RenderViewHost>(this),
+      content::Details<bool>(&proceed));
 
   RenderViewHostDelegate::RendererManagement* management_delegate =
       delegate_->GetRendererManagementDelegate();
   if (management_delegate) {
     management_delegate->ShouldClosePage(
         unload_ack_is_for_cross_site_transition_, proceed);
   }
 
   // If canceled, notify the delegate to cancel its pending navigation entry.
   if (!proceed)
@@ skipping 318 matching lines @@
 
 void RenderViewHost::OnWebUISend(const GURL& source_url,
                                  const std::string& name,
                                  const base::ListValue& args) {
   delegate_->WebUISend(this, source_url, name, args);
 }
 
 void RenderViewHost::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }