Move Extension into extensions namespace

chrome/common/extensions/manifest_tests/extension_manifests_update_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_manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
+
 namespace errors = extension_manifest_errors;
 
 TEST_F(ExtensionManifestTest, UpdateUrls) {
   // Test several valid update urls
   Testcase testcases[] = {
     Testcase("update_url_valid_1.json", Extension::INTERNAL,
              Extension::STRICT_ERROR_CHECKS),
     Testcase("update_url_valid_2.json", Extension::INTERNAL,
              Extension::STRICT_ERROR_CHECKS),
     Testcase("update_url_valid_3.json", Extension::INTERNAL,
@@ skipping 15 matching lines @@
              Extension::INTERNAL,
              Extension::STRICT_ERROR_CHECKS),
     Testcase("update_url_invalid_3.json",
              errors::kInvalidUpdateURL,
              Extension::INTERNAL,
              Extension::STRICT_ERROR_CHECKS)
   };
   RunTestcases(testcases2, arraysize(testcases2),
                EXPECT_TYPE_ERROR);
 }