Don't send ViewMsg_ContextMenuClosed to the renderer process for submenus.

content/renderer/pepper_plugin_delegate_impl.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/renderer/pepper_plugin_delegate_impl.h"
 
 #include <cmath>
 #include <queue>
 
 #include "base/callback.h"
@@ skipping 1208 matching lines @@
     pending_context_menus_.Remove(request_id);
     return PP_ERROR_FAILED;
   }
 
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PepperPluginDelegateImpl::OnContextMenuClosed(
     const webkit_glue::CustomContextMenuContext& custom_context) {
   int request_id = custom_context.request_id;
-  scoped_refptr<webkit::ppapi::PPB_Flash_Menu_Impl> menu =
-      *pending_context_menus_.Lookup(request_id);
-  if (!menu) {
+  scoped_refptr<webkit::ppapi::PPB_Flash_Menu_Impl>* menu_ptr =
+      pending_context_menus_.Lookup(request_id);
+  if (!menu_ptr) {
     NOTREACHED() << "CompleteShowContextMenu() called twice for the same menu.";
     return;
   }
+  scoped_refptr<webkit::ppapi::PPB_Flash_Menu_Impl> menu = *menu_ptr;
+  DCHECK(menu.get());
   pending_context_menus_.Remove(request_id);
 
   if (has_saved_context_menu_action_) {
     menu->CompleteShow(PP_OK, saved_context_menu_action_);
     has_saved_context_menu_action_ = false;
     saved_context_menu_action_ = 0;
   } else {
     menu->CompleteShow(PP_ERROR_USERCANCEL, 0);
   }
 }
@@ skipping 99 matching lines @@
   if (!base::SharedMemory::IsHandleValid(handle)) {
     DLOG(WARNING) << "Browser failed to allocate shared memory";
     return NULL;
   }
   return new base::SharedMemory(handle, false);
 }
 
 ppapi::Preferences PepperPluginDelegateImpl::GetPreferences() {
   return ppapi::Preferences(render_view_->webkit_preferences());
 }