browser: Add missing OVERRIDE annotation to ExternalTabContainer implementing TabContentsDelegate.

chrome/browser/external_tab_container_win.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 "chrome/browser/external_tab_container_win.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/i18n/rtl.h"
@@ skipping 518 matching lines @@
                                         const gfx::Rect& pos) {
   if (automation_ && is_popup_window_)
     automation_->Send(new AutomationMsg_MoveWindow(tab_handle_, pos));
 }
 
 TabContentsWrapper* ExternalTabContainer::GetConstrainingContentsWrapper(
     TabContentsWrapper* source) {
   return source;
 }
 
-bool ExternalTabContainer::IsPopup(const TabContents* source) const {
+bool ExternalTabContainer::IsPopupOrPanel(const TabContents* source) const {
   return is_popup_window_;
 }
 
 void ExternalTabContainer::UpdateTargetURL(TabContents* source,
                                            int32 page_id,
                                            const GURL& url) {
   Browser::UpdateTargetURLHelper(source, page_id, url);
   if (automation_) {
     std::wstring url_string = CA2W(url.spec().c_str());
     automation_->Send(
@@ skipping 676 matching lines @@
   if (params.disposition == CURRENT_TAB) {
     DCHECK(route_all_top_level_navigations_);
     forward_params.disposition = NEW_FOREGROUND_TAB;
   }
   TabContents* new_contents =
       ExternalTabContainer::OpenURLFromTab(source, forward_params);
   // support only one navigation for a dummy tab before it is killed.
   ::DestroyWindow(GetNativeView());
   return new_contents;
 }