Use a direct include of strings headers in x/.

chrome/browser/ui/views/location_bar/icon_label_bubble_view.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_LOCATION_BAR_ICON_LABEL_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ICON_LABEL_BUBBLE_VIEW_H_
 
 #include <string>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/gfx/size.h"
 #include "ui/views/view.h"
 
 namespace gfx {
 class Canvas;
 class Font;
 class ImageSkia;
 }
 
 namespace views {
@@ skipping 49 matching lines @@
   // The contents of the bubble.
   views::ImageView* image_;
   views::Label* label_;
 
   bool is_extension_icon_;
 
   DISALLOW_COPY_AND_ASSIGN(IconLabelBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ICON_LABEL_BUBBLE_VIEW_H_