Revert 121031 - Eliminate DownloadProgressUpdated.

content/public/browser/download_manager_delegate.h

Index: content/public/browser/download_manager_delegate.h
===================================================================
--- content/public/browser/download_manager_delegate.h	(revision 121040)
+++ content/public/browser/download_manager_delegate.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -115,6 +115,9 @@
                               const FilePath::StringType& default_extension,
                               bool can_save_as_complete,
                               SaveFilePathPickedCallback callback) {}
+
+  // Informs the delegate that the progress of downloads has changed.
+  virtual void DownloadProgressUpdated() {}
 };
 
 }  // namespace content