Cleanup usage of history namespace in components/history

chrome/browser/ui/cocoa/history_menu_bridge.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_HISTORY_MENU_BRIDGE_H_
 #define CHROME_BROWSER_UI_COCOA_HISTORY_MENU_BRIDGE_H_
 
 #import <Cocoa/Cocoa.h>
 #include <map>
 #include <vector>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/ref_counted.h"
 #include "base/scoped_observer.h"
 #include "base/task/cancelable_task_tracker.h"
 #import "chrome/browser/favicon/favicon_service.h"
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_observer.h"
 #import "chrome/browser/ui/cocoa/main_menu_item.h"
 #include "components/history/core/browser/history_service_observer.h"
 #include "components/sessions/session_id.h"
 
-class PageUsageData;
 class Profile;
 class TabRestoreService;
 @class HistoryMenuCocoaController;
 
 namespace {
 class HistoryMenuBridgeTest;
 }
 
 namespace favicon_base {
 struct FaviconImageResult;
@@ skipping 203 matching lines @@
   // The default favicon if a HistoryItem does not have one.
   base::scoped_nsobject<NSImage> default_favicon_;
 
   ScopedObserver<HistoryService, HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryMenuBridge);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_HISTORY_MENU_BRIDGE_H_