chrome: Cleanup class/struct forward declarations

chrome/browser/download/download_target_determiner.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "build/build_config.h"
 #include "chrome/browser/download/download_path_reservation_tracker.h"
 #include "chrome/browser/download/download_target_determiner_delegate.h"
 #include "chrome/browser/download/download_target_info.h"
 #include "chrome/common/safe_browsing/download_file_types.pb.h"
 #include "content/public/browser/download_danger_type.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager_delegate.h"
 #include "ppapi/features/features.h"
 
-class ChromeDownloadManagerDelegate;
 class Profile;
 class DownloadPrefs;
 
 namespace content {
 enum DownloadDangerType;
 }
 
 // Determines the target of the download.
 //
 // Terminology:
@@ skipping 290 matching lines @@
   DownloadTargetDeterminerDelegate* delegate_;
   CompletionCallback completion_callback_;
   base::CancelableTaskTracker history_tracker_;
 
   base::WeakPtrFactory<DownloadTargetDeterminer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadTargetDeterminer);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_TARGET_DETERMINER_H_