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

chrome/browser/importer/firefox_importer_utils.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_IMPORTER_FIREFOX_IMPORTER_UTILS_H_
 #define CHROME_BROWSER_IMPORTER_FIREFOX_IMPORTER_UTILS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "build/build_config.h"
 
 class GURL;
 class TemplateURL;
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 }
 
@@ skipping 74 matching lines @@
 std::string GetPrefsJsValue(const std::string& prefs,
                             const std::string& pref_key);
 
 // Returns the localized Firefox branding name.
 // This is useful to differentiate between Firefox and Iceweasel.
 // If anything goes wrong while trying to obtain the branding name,
 // the function assumes it's Firefox.
 string16 GetFirefoxImporterName(const base::FilePath& app_path);
 
 #endif  // CHROME_BROWSER_IMPORTER_FIREFOX_IMPORTER_UTILS_H_