Use a direct include of strings headers in chrome/browser/ui/cocoa/.

chrome/browser/ui/cocoa/status_bubble_mac.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_UI_COCOA_STATUS_BUBBLE_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_STATUS_BUBBLE_MAC_H_
 
 #include <string>
 
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/QuartzCore.h>
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/ui/status_bubble.h"
 #include "googleurl/src/gurl.h"
 
 class StatusBubbleMacTest;
 
 class StatusBubbleMac : public StatusBubble {
  public:
   // The various states that a status bubble may be in.  Public for delegate
   // access (for testing).
   enum StatusBubbleState {
@@ skipping 157 matching lines @@
 @interface NSObject(StatusBubbleDelegate)
 // Called to query the delegate about the frame StatusBubble should position
 // itself in. Frame is returned in the parent window coordinates.
 - (NSRect)statusBubbleBaseFrame;
 
 // Called from SetState to notify the delegate of state changes.
 - (void)statusBubbleWillEnterState:(StatusBubbleMac::StatusBubbleState)state;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_STATUS_BUBBLE_MAC_H_