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

chrome/common/extensions/manifest_tests/extension_manifests_platformapp_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 <memory>
 
 #include "base/command_line.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 108 matching lines @@
   // it contain no permissions dictionary.
   std::string error;
   std::unique_ptr<base::DictionaryValue> manifest(
       LoadManifest("init_valid_platform_app.json", &error));
 
   std::vector<std::unique_ptr<ManifestData>> manifests;
   // Create each manifest.
   for (const char* api_name : kPlatformAppExperimentalApis) {
     // DictionaryValue will take ownership of this ListValue.
     base::ListValue *permissions = new base::ListValue();
-    permissions->Append(new base::StringValue("experimental"));
-    permissions->Append(new base::StringValue(api_name));
+    permissions->AppendString("experimental");
+    permissions->AppendString(api_name);
     manifest->Set("permissions", permissions);
     manifests.push_back(
         base::WrapUnique(new ManifestData(manifest->CreateDeepCopy(), "")));
   }
   // First try to load without any flags. This should warn for every API.
   for (const std::unique_ptr<ManifestData>& manifest : manifests) {
     LoadAndExpectWarning(
         *manifest,
         "'experimental' requires the 'experimental-extension-apis' "
         "command line switch to be enabled.");
   }
 
   // Now try again with the experimental flag set.
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);
   for (const std::unique_ptr<ManifestData>& manifest : manifests)
     LoadAndExpectSuccess(*manifest);
 }
 
 }  // namespace extensions