Reduce header dependencies in base/

chrome/browser/download/download_manager.h

 // Copyright (c) 2006-2009 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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active profile in Chrome.
 //
 // Each download is represented by a DownloadItem, and all DownloadItems
@@ skipping 30 matching lines @@
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/hash_tables.h"
 #include "base/observer_list.h"
 #include "base/ref_counted.h"
 #include "base/time.h"
+#include "base/timer.h"
 #include "chrome/browser/cancelable_request.h"
 #include "chrome/browser/history/download_types.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/shell_dialogs.h"
 #include "chrome/common/pref_member.h"
 
 class DownloadFileManager;
 class DownloadItemView;
 class DownloadManager;
 class GURL;
@@ skipping 529 matching lines @@
   PendingFinishedMap pending_finished_downloads_;
 
   // The "Save As" dialog box used to ask the user where a file should be
   // saved.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_