Use a direct include of strings headers in chrome/browser/d*/.

chrome/browser/download/download_shelf_context_menu.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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "content/public/browser/download_item.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace content {
 class PageNavigator;
 }
 
 // This class is responsible for the download shelf context menu. Platform
 // specific subclasses are responsible for creating and running the menu.
 //
@@ skipping 59 matching lines @@
   // Information source.
   content::DownloadItem* download_item_;
 
   // Used to open tabs.
   content::PageNavigator* navigator_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadShelfContextMenu);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_H_