content: Cleanup class/struct forward declarations

content/browser/download/download_file_impl.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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 
 #include "content/browser/download/download_file.h"
 
 #include <stddef.h>
@@ skipping 10 matching lines @@
 #include "base/timer/timer.h"
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/base_file.h"
 #include "content/browser/download/rate_estimator.h"
 #include "content/public/browser/download_save_info.h"
 #include "net/log/net_log_with_source.h"
 
 namespace content {
 class ByteStreamReader;
 class DownloadDestinationObserver;
-class DownloadManager;
-struct DownloadCreateInfo;
 
 class CONTENT_EXPORT DownloadFileImpl : public DownloadFile {
  public:
   // Takes ownership of the object pointed to by |request_handle|.
   // |net_log| will be used for logging the download file's events.
   // May be constructed on any thread.  All methods besides the constructor
   // (including destruction) must occur on the FILE thread.
   //
   // Note that the DownloadFileImpl automatically reads from the passed in
   // stream, and sends updates and status of those reads to the
@@ skipping 102 matching lines @@
   base::WeakPtr<DownloadDestinationObserver> observer_;
 
   base::WeakPtrFactory<DownloadFileImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_