Move Extension into extensions namespace

chrome/common/extensions/manifest_tests/extension_manifests_tts_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"
 
 namespace errors = extension_manifest_errors;
@@ skipping 15 matching lines @@
     Testcase("tts_engine_invalid_7.json",
              errors::kInvalidTtsVoicesGender),
     Testcase("tts_engine_invalid_8.json",
              errors::kInvalidTtsVoicesEventTypes),
     Testcase("tts_engine_invalid_9.json",
              errors::kInvalidTtsVoicesEventTypes)
   };
   RunTestcases(testcases, arraysize(testcases),
                EXPECT_TYPE_ERROR);
 
-  scoped_refptr<Extension> extension(
+  scoped_refptr<extensions::Extension> extension(
       LoadAndExpectSuccess("tts_engine_valid.json"));
 
   ASSERT_EQ(1u, extension->tts_voices().size());
   EXPECT_EQ("name", extension->tts_voices()[0].voice_name);
   EXPECT_EQ("en-US", extension->tts_voices()[0].lang);
   EXPECT_EQ("female", extension->tts_voices()[0].gender);
   EXPECT_EQ(3U, extension->tts_voices()[0].event_types.size());
 }