Move Extension into extensions namespace

chrome/common/extensions/manifest_tests/extension_manifests_offline_unittest.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/common/extensions/manifest_tests/extension_manifest_test.h"
 
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
+
 namespace errors = extension_manifest_errors;
 
 TEST_F(ExtensionManifestTest, OfflineEnabled) {
   LoadAndExpectError("offline_enabled_invalid.json",
                      errors::kInvalidOfflineEnabled);
   scoped_refptr<Extension> extension_0(
       LoadAndExpectSuccess("offline_enabled_extension.json"));
   EXPECT_TRUE(extension_0->offline_enabled());
   scoped_refptr<Extension> extension_1(
       LoadAndExpectSuccess("offline_enabled_packaged_app.json"));
   EXPECT_TRUE(extension_1->offline_enabled());
   scoped_refptr<Extension> extension_2(
       LoadAndExpectSuccess("offline_disabled_packaged_app.json"));
   EXPECT_FALSE(extension_2->offline_enabled());
   scoped_refptr<Extension> extension_3(
       LoadAndExpectSuccess("offline_default_packaged_app.json"));
   EXPECT_FALSE(extension_3->offline_enabled());
   scoped_refptr<Extension> extension_4(
       LoadAndExpectSuccess("offline_enabled_hosted_app.json"));
   EXPECT_TRUE(extension_4->offline_enabled());
 }