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

chrome/browser/speech/speech_recognition_bubble.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_SPEECH_SPEECH_RECOGNITION_BUBBLE_H_
 #define CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_BUBBLE_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/layout.h"
 #include "ui/gfx/image/image_skia.h"
 
 class SkBitmap;
 class SkCanvas;
 
 namespace content {
 class WebContents;
 }
 
@@ skipping 166 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionBubbleBase);
 };
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef SpeechRecognitionBubble::Delegate SpeechRecognitionBubbleDelegate;
 
 #endif  // CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_BUBBLE_H_