Moved ExtensionPrefs and related into extensions namespace

chrome/browser/extensions/extension_prefs_scope.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_PREFS_SCOPE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_SCOPE_H_
 #pragma once
 
 #include "base/basictypes.h"
 
+namespace extensions {
+
 // Scope for a preference.
 enum ExtensionPrefsScope {
   // Regular profile and incognito.
   kExtensionPrefsScopeRegular,
   // Regular profile only.
   kExtensionPrefsScopeRegularOnly,
   // Incognito profile; preference is persisted to disk and remains active
   // after a browser restart.
   kExtensionPrefsScopeIncognitoPersistent,
   // Incognito profile; preference is kept in memory and deleted when the
   // incognito session is terminated.
   kExtensionPrefsScopeIncognitoSessionOnly
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_SCOPE_H_