Move Extension into extensions namespace

chrome/common/extensions/manifest_tests/extension_manifests_default_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"
 
 namespace errors = extension_manifest_errors;
 
 TEST_F(ExtensionManifestTest, DefaultPathForExtent) {
-  scoped_refptr<Extension> extension(
+  scoped_refptr<extensions::Extension> extension(
       LoadAndExpectSuccess("default_path_for_extent.json"));
 
   ASSERT_EQ(1u, extension->web_extent().patterns().size());
   EXPECT_EQ("/*", extension->web_extent().patterns().begin()->path());
   EXPECT_TRUE(extension->web_extent().MatchesURL(
       GURL("http://www.google.com/monkey")));
 }
 
 TEST_F(ExtensionManifestTest, DefaultLocale) {
   LoadAndExpectError("default_locale_invalid.json",
                      errors::kInvalidDefaultLocale);
 
-  scoped_refptr<Extension> extension(
+  scoped_refptr<extensions::Extension> extension(
       LoadAndExpectSuccess("default_locale_valid.json"));
   EXPECT_EQ("de-AT", extension->default_locale());
 }