chrome: Cleanup class/struct forward declarations

chrome/browser/download/download_request_limiter.h

 // Copyright (c) 2012 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_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/browser/web_contents_observer.h"
 
 class HostContentSettingsMap;
-class DownloadRequestInfoBarDelegateAndroid;
 
 namespace content {
 class NavigationController;
 class WebContents;
 }
 
 // DownloadRequestLimiter is responsible for determining whether a download
 // should be allowed or not. It is designed to keep pages from downloading
 // multiple files without user interaction. DownloadRequestLimiter is invoked
 // from ResourceDispatcherHost any time a download begins
@@ skipping 207 matching lines @@
   StateMap state_map_;
 
   // Weak ptr factory used when |CanDownload| asks the delegate asynchronously
   // about the download.
   base::WeakPtrFactory<DownloadRequestLimiter> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadRequestLimiter);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_REQUEST_LIMITER_H_