InstantExtended: Remove overlay control code.

chrome/browser/search/instant_extended_context_menu_observer.cc

-// Copyright 2013 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/search/instant_extended_context_menu_observer.h"
-
-#include "base/logging.h"
-#include "chrome/app/chrome_command_ids.h"
-#include "chrome/browser/search/search.h"
-
-InstantExtendedContextMenuObserver::InstantExtendedContextMenuObserver(
-    content::WebContents* contents)
-    : is_instant_overlay_(chrome::IsInstantOverlay(contents)) {
-}
-
-InstantExtendedContextMenuObserver::~InstantExtendedContextMenuObserver() {
-}
-
-bool InstantExtendedContextMenuObserver::IsCommandIdSupported(int command_id) {
-  switch (command_id) {
-    case IDC_BACK:
-    case IDC_FORWARD:
-    case IDC_PRINT:
-    case IDC_RELOAD:
-      return is_instant_overlay_;
-    default:
-      return false;
-  }
-}
-
-bool InstantExtendedContextMenuObserver::IsCommandIdEnabled(int command_id) {
-  DCHECK(IsCommandIdSupported(command_id));
-  return false;
-}