Moving preference API into api/preferences

chrome/browser/extensions/api/preference/preference_helpers.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_EXTENSIONS_EXTENSION_PREFERENCE_HELPERS_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_HELPERS_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_HELPERS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_HELPERS_H_
 
 #include <string>
 
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/browser/extensions/extension_prefs_scope.h"
 
 class Profile;
 
 namespace base {
 class ListValue;
 };
 
-namespace extension_preference_helpers {
+namespace extensions {
+namespace preference_helpers {
 
 bool StringToScope(const std::string& s,
                    extensions::ExtensionPrefsScope* scope);
 
 // Returns a string constant (defined in the API) indicating the level of
 // control this extension has over the specified preference.
 const char* GetLevelOfControl(
     Profile* profile,
     const std::string& extension_id,
     const std::string& browser_pref,
     bool incognito);
 
 // Dispatches |event_name| to extensions listening to the event and holding
 // |permission|. |args| is passed as arguments to the event listener.  A
 // key-value for the level of control the extension has over |browser_pref| is
 // injected into the first item of |args|, which must be of type
 // DictionaryValue.
 void DispatchEventToExtensions(
     Profile* profile,
     const std::string& event_name,
     base::ListValue* args,
     extensions::APIPermission::ID permission,
     bool incognito,
     const std::string& browser_pref);
 
-} // namespace extension_preference_helpers
+}  // namespace preference_helpers
+}  // namespace extensions
 
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_HELPERS_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_API_PREFERENCE_PREFERENCE_HELPERS_H_