Use a direct include of strings headers in components/, part 1.

components/autofill/browser/autofill_popup_delegate.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 COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_POPUP_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_POPUP_DELEGATE_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 namespace content {
 class KeyboardListener;
 }
 
 namespace autofill {
 
 // An interface for interaction with AutofillPopupController. Will be notified
 // of events by the controller.
 class AutofillPopupDelegate {
@@ skipping 18 matching lines @@
   virtual void RemoveSuggestion(const base::string16& value,
                                 int identifier) = 0;
 
   // Informs the delegate that the Autofill previewed form should be cleared.
   virtual void ClearPreviewedForm() = 0;
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_POPUP_DELEGATE_H_