FBTF: Remove "obviously" unneeded standard C++ library #includes.

chrome/browser/download/download_shelf.h

Index: chrome/browser/download/download_shelf.h
diff --git a/chrome/browser/download/download_shelf.h b/chrome/browser/download/download_shelf.h
index 929a92ee4e757f002d7a7ab9f9574116f954a027..df025085713e5a267e0f25dfd13f47880de7f936 100644
--- a/chrome/browser/download/download_shelf.h
+++ b/chrome/browser/download/download_shelf.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -6,12 +6,11 @@
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_
 #pragma once
 
-#include <string>
-
 #include "app/menus/simple_menu_model.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
+#include "base/string16.h"
 
 class BaseDownloadItemModel;
 class Browser;