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

chrome/browser/background/background_application_list_model_unittest.cc

Index: chrome/browser/background/background_application_list_model_unittest.cc
diff --git a/chrome/browser/background/background_application_list_model_unittest.cc b/chrome/browser/background/background_application_list_model_unittest.cc
index 103d9e27067c8a6afee42d685d8226b9402e9287..e1af42d5833f61d2d41ab570d4f110b96938afe2 100644
--- a/chrome/browser/background/background_application_list_model_unittest.cc
+++ b/chrome/browser/background/background_application_list_model_unittest.cc
@@ -83,7 +83,7 @@ static scoped_refptr<Extension> CreateExtension(
   base::ListValue* permissions = new base::ListValue();
   manifest.Set(extensions::manifest_keys::kPermissions, permissions);
   if (background_permission) {
-    permissions->Append(new base::StringValue("background"));
+    permissions->AppendString("background");
   }
 
   std::string error;