Remove CreateEmptyExtension from extension_function_test_utils

extensions/common/test_util.cc

 // Copyright 2014 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 "extensions/common/test_util.h"
 
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_builder.h"
 #include "extensions/common/value_builder.h"
 
 namespace extensions {
 namespace test_util {
 
 ExtensionBuilder& BuildExtension(ExtensionBuilder& builder) {
   return builder
          .SetManifest(DictionaryBuilder()
                       .Set("name", "Test extension")
                       .Set("version", "1.0")
                       .Set("manifest_version", 2));
 }
 
 scoped_refptr<Extension> CreateEmptyExtension() {
-  scoped_refptr<Extension> empty_extension(
-      ExtensionBuilder()
-          .SetManifest(
-               DictionaryBuilder().Set("name", "Test").Set("version", "1.0"))
-          .Build());
-  return empty_extension;
+  return ExtensionBuilder()
+      .SetManifest(
+           DictionaryBuilder().Set("name", "Test").Set("version", "1.0"))
+      .Build();
 }
 
-scoped_refptr<Extension> CreateExtensionWithID(const std::string& id) {
+scoped_refptr<Extension> CreateEmptyExtension(const std::string& id) {
   return ExtensionBuilder()
       .SetManifest(
            DictionaryBuilder().Set("name", "test").Set("version", "0.1"))
       .SetID(id)
       .Build();
 }
 
 }  // namespace test_util
 }  // namespace extensions