Refactor downloads into a ProfileKeyedService.

content/browser/download/download_manager.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.
 //
 // 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 browser context in Chrome.
 //
 // Download observers:
@@ skipping 276 matching lines @@
 
   // Called when Save Page download is done.
   void SavePageDownloadFinished(DownloadItem* download);
 
   // Get the download item from the active map.  Useful when the item is not
   // yet in the history map.
   DownloadItem* GetActiveDownloadItem(int id);
 
   DownloadManagerDelegate* delegate() const { return delegate_; }
 
+  // For testing only.  May be called from tests indirectly (through
+  // other for testing only methods).
+  void SetDownloadManagerDelegate(DownloadManagerDelegate* delegate);
+
  private:
   typedef std::set<DownloadItem*> DownloadSet;
   typedef base::hash_map<int64, DownloadItem*> DownloadMap;
 
   // For testing.
   friend class DownloadManagerTest;
+  friend class DownloadTest;
   friend class MockDownloadManager;
-  friend class DownloadTest;
 
   friend class base::RefCountedThreadSafe<DownloadManager,
                                           BrowserThread::DeleteOnUIThread>;
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
   friend class DeleteTask<DownloadManager>;
 
-  void set_delegate(DownloadManagerDelegate* delegate) { delegate_ = delegate; }
-
   virtual ~DownloadManager();
 
   // Called on the FILE thread to check the existence of a downloaded file.
   void CheckForFileRemovalOnFileThread(int64 db_handle, const FilePath& path);
 
   // Called on the UI thread if the FILE thread detects the removal of
   // the downloaded file. The UI thread updates the state of the file
   // and then notifies this update to the file's observer.
   void OnFileRemovalDetected(int64 db_handle);
 
@@ skipping 104 matching lines @@
   DownloadManagerDelegate* delegate_;
 
   // TODO(rdsmith): Remove when http://crbug.com/85408 is fixed.
   // For debugging only.
   int64 largest_db_handle_in_history_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_