Here is the implementation of those two methods from the upgraded Products module:
/// Clears the Urls collection for this item.
/// <param name="excludeDefault">if set to <c>true</c> default urls will not be cleared.</param>
/// Removes all urls that satisfy the condition that is checked in the predicate function.
/// <param name="predicate">A function to test each element for a condition.</param>
I've omitted to include those in the blog post providing instructions. I'll update it to also contain the implementation of those two methods.
the Telerik team