Use a direct include of strings headers in x/.

chrome/browser/ui/views/status_bubble_views.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_UI_VIEWS_STATUS_BUBBLE_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_STATUS_BUBBLE_VIEWS_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.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"
 #include "ui/gfx/rect.h"
 
 namespace gfx {
 class Point;
 }
 namespace views {
 class View;
 class Widget;
@@ skipping 115 matching lines @@
   // change size immediately, with no hover.
   bool is_expanded_;
 
   // Times expansion of status bubble when URL is too long for standard width.
   base::WeakPtrFactory<StatusBubbleViews> expand_timer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusBubbleViews);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_STATUS_BUBBLE_VIEWS_H_