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

chrome/browser/ui/autofill/autofill_popup_controller_impl.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_AUTOFILL_AUTOFILL_POPUP_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_POPUP_CONTROLLER_IMPL_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/ui/autofill/autofill_popup_controller.h"
 #include "content/public/browser/keyboard_listener.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_f.h"
 
 namespace gfx {
 class Display;
 }
 
@@ skipping 190 matching lines @@
   // The line that is currently selected by the user.
   // |kNoSelection| indicates that no line is currently selected.
   int selected_line_;
 
   base::WeakPtrFactory<AutofillPopupControllerImpl> weak_ptr_factory_;
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_AUTOFILL_POPUP_CONTROLLER_IMPL_H_