Use a direct include of strings headers in chrome/browser/ui/b*-p*/.

chrome/browser/ui/extensions/app_metro_infobar_delegate_win.h

 // Copyright 2013 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_UI_EXTENSIONS_APP_METRO_INFOBAR_DELEGATE_WIN_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_APP_METRO_INFOBAR_DELEGATE_WIN_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/infobars/confirm_infobar_delegate.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "ui/base/window_open_disposition.h"
 
 class Profile;
 
 namespace gfx {
 class Image;
 }
 
@@ skipping 32 matching lines @@
 
   Mode mode_;
   std::string extension_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AppMetroInfoBarDelegateWin);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_APP_METRO_INFOBAR_DELEGATE_WIN_H_