Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //extensions

extensions/common/extension_set_unittest.cc

 // Copyright 2013 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/extension_set.h"
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 20 matching lines @@
   base::DictionaryValue manifest;
   manifest.SetString("name", name);
   manifest.SetString("version", "1");
 
   if (!launch_url.empty())
     manifest.SetString("app.launch.web_url", launch_url);
 
   if (!extent.empty()) {
     base::ListValue* urls = new base::ListValue();
     manifest.Set("app.urls", urls);
-    urls->Append(new base::StringValue(extent));
+    urls->AppendString(extent);
   }
 
   std::string error;
   scoped_refptr<Extension> extension(
       Extension::Create(path, Manifest::INTERNAL, manifest,
                         Extension::NO_FLAGS, &error));
   EXPECT_TRUE(extension.get()) << error;
   return extension;
 }
 
@@ skipping 89 matching lines @@
 
   ASSERT_TRUE(extensions.Contains(ext3->id()));
   ASSERT_TRUE(extensions.InsertAll(*to_add));
   EXPECT_EQ(4u, extensions.size());
 
   ASSERT_FALSE(extensions.InsertAll(*to_add));  // Re-adding same set no-ops.
   EXPECT_EQ(4u, extensions.size());
 }
 
 }  // namespace extensions