Use a direct include of strings headers in chrome/browser/r*-s*/.

chrome/browser/status_icons/status_icon.h

 // 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.
 
 #ifndef CHROME_BROWSER_STATUS_ICONS_STATUS_ICON_H_
 #define CHROME_BROWSER_STATUS_ICONS_STATUS_ICON_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace ui {
 class MenuModel;
 }
 
 class StatusIconObserver;
@@ skipping 44 matching lines @@
  private:
   ObserverList<StatusIconObserver> observers_;
 
   // Context menu, if any.
   scoped_ptr<ui::MenuModel> context_menu_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusIcon);
 };
 
 #endif  // CHROME_BROWSER_STATUS_ICONS_STATUS_ICON_H_