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

chrome/browser/autocomplete/autocomplete_classifier.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_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 
 class AutocompleteController;
 struct AutocompleteMatch;
 class GURL;
 class Profile;
 
 class AutocompleteClassifier : public BrowserContextKeyedService {
  public:
   // Bitmap of AutocompleteProvider::Type values describing the default set of
@@ skipping 35 matching lines @@
   scoped_ptr<AutocompleteController> controller_;
 
   // Are we currently in Classify? Used to verify Classify isn't invoked
   // recursively, since this can corrupt state and cause crashes.
   bool inside_classify_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteClassifier);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_