Added ability to set ChromeDownloadManagerDelegate for testing.

content/browser/download/download_manager.h

Index: content/browser/download/download_manager.h
diff --git a/content/browser/download/download_manager.h b/content/browser/download/download_manager.h
index 542536f771e1f78352163a03f61d632af4f7c0e1..06803ce3a9fa4bd6068242941f2bf7c8eb1420df 100644
--- a/content/browser/download/download_manager.h
+++ b/content/browser/download/download_manager.h
@@ -276,12 +276,15 @@ class CONTENT_EXPORT DownloadManager
   // For testing.
   friend class DownloadManagerTest;
   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.