Move Extension into extensions namespace

chrome/browser/extensions/pending_extension_info.cc

 // 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.
 
 #include "chrome/browser/extensions/pending_extension_info.h"
 
 PendingExtensionInfo::PendingExtensionInfo(
     const GURL& update_url,
     const Version& version,
     ShouldAllowInstallPredicate should_allow_install,
     bool is_from_sync,
     bool install_silently,
-    Extension::Location install_source)
+    extensions::Extension::Location install_source)
     : update_url_(update_url),
       version_(version),
       should_allow_install_(should_allow_install),
       is_from_sync_(is_from_sync),
       install_silently_(install_silently),
       install_source_(install_source) {}
 
 PendingExtensionInfo::PendingExtensionInfo()
     : update_url_(),
       should_allow_install_(NULL),
       is_from_sync_(true),
       install_silently_(false),
-      install_source_(Extension::INVALID) {}
+      install_source_(extensions::Extension::INVALID) {}