Remove Downcasting RVContextMenuBase in ContextMenuDeleagate implementations.

components/renderer_context_menu/render_view_context_menu_base.cc

 // Copyright 2014 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 "components/renderer_context_menu/render_view_context_menu_base.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 154 matching lines @@
 RenderViewContextMenuBase::~RenderViewContextMenuBase() {
 }
 
 // Menu construction functions -------------------------------------------------
 
 void RenderViewContextMenuBase::Init() {
   // Command id range must have been already initializerd.
   DCHECK_NE(-1, content_context_custom_first);
   DCHECK_NE(-1, content_context_custom_last);
 
+  CalculateScreenCoordinatesInParams();
+
   InitMenu();
   if (toolkit_delegate_)
     toolkit_delegate_->Init(&menu_model_);
 }
 
 void RenderViewContextMenuBase::Cancel() {
   if (toolkit_delegate_)
     toolkit_delegate_->Cancel();
 }
 
@@ skipping 195 matching lines @@
 }
 
 bool RenderViewContextMenuBase::IsCustomItemChecked(int id) const {
   return IsCustomItemCheckedInternal(params_.custom_items, id);
 }
 
 bool RenderViewContextMenuBase::IsCustomItemEnabled(int id) const {
   return IsCustomItemEnabledInternal(params_.custom_items, id);
 }