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

chrome/common/extensions/manifest_tests/extension_manifests_background_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/values.h"
 #include "chrome/common/extensions/features/feature_channel.h"
 #include "chrome/common/extensions/manifest_tests/chrome_manifest_test.h"
@@ skipping 85 matching lines @@
       LoadManifest("background_page.json", &error));
   ASSERT_TRUE(manifest.get());
   manifest->SetBoolean(keys::kBackgroundPersistent, false);
   manifest->SetInteger(keys::kManifestVersion, 2);
   scoped_refptr<Extension> extension(
       LoadAndExpectSuccess(ManifestData(manifest.get(), "")));
   ASSERT_TRUE(extension.get());
   EXPECT_TRUE(BackgroundInfo::HasLazyBackgroundPage(extension.get()));
 
   base::ListValue* permissions = new base::ListValue();
-  permissions->Append(new base::StringValue("webRequest"));
+  permissions->AppendString("webRequest");
   manifest->Set(keys::kPermissions, permissions);
   LoadAndExpectError(ManifestData(manifest.get(), ""),
                      errors::kWebRequestConflictsWithLazyBackground);
 }
 
 TEST_F(ExtensionManifestBackgroundTest, BackgroundPagePersistentPlatformApp) {
   scoped_refptr<Extension> extension =
       LoadAndExpectSuccess("background_page_persistent_app.json");
   ASSERT_TRUE(extension->is_platform_app());
   ASSERT_TRUE(BackgroundInfo::HasBackgroundPage(extension.get()));
@@ skipping 19 matching lines @@
   std::string error;
   std::vector<InstallWarning> warnings;
   ManifestHandler::ValidateExtension(extension.get(), &error, &warnings);
   // The key 'background.persistent' is not supported for packaged apps.
   EXPECT_EQ(1U, warnings.size());
   EXPECT_EQ(errors::kBackgroundPersistentInvalidForPlatformApps,
             warnings[0].message);
 }
 
 }  // namespace extensions