Add return values to SyncerCommand

chrome/browser/sync/engine/download_updates_command.h

Index: chrome/browser/sync/engine/download_updates_command.h
diff --git a/chrome/browser/sync/engine/download_updates_command.h b/chrome/browser/sync/engine/download_updates_command.h
index 293c99a333095bd315dd9ffe78dd5ccc2fd51f04..3b12c714aa7fff42df0f1376dd6873eaa3f1169a 100644
--- a/chrome/browser/sync/engine/download_updates_command.h
+++ b/chrome/browser/sync/engine/download_updates_command.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -44,7 +44,7 @@ class DownloadUpdatesCommand : public SyncerCommand {
   virtual ~DownloadUpdatesCommand();
 
   // SyncerCommand implementation.
-  virtual void ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
+  virtual SyncerError ExecuteImpl(sessions::SyncSession* session) OVERRIDE;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(DownloadUpdatesCommandTest, VerifyAppendDebugInfo);