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

sync/test/fake_server/fake_server.cc

Index: sync/test/fake_server/fake_server.cc
diff --git a/sync/test/fake_server/fake_server.cc b/sync/test/fake_server/fake_server.cc
index 0b1229e422beccbcaa3393acded8ad8e623b98be..969906682690210da9ac0050ee9da2253aee6adf 100644
--- a/sync/test/fake_server/fake_server.cc
+++ b/sync/test/fake_server/fake_server.cc
@@ -550,7 +550,7 @@ FakeServer::GetEntitiesAsDictionaryValue() {
     // TODO(pvalenzuela): Store more data for each entity so additional
     // verification can be performed. One example of additional verification
     // is checking the correctness of the bookmark hierarchy.
-    list_value->Append(new base::StringValue(entity.GetName()));
+    list_value->AppendString(entity.GetName());
   }
 
   return dictionary;