Content URL cache does not invalidate cache remotely

Description

DefaultContentUrlCache is using IObjectInstanceCache and not ISynchronizedObjectInstanceCache. Therefore, URLs are not removed from all instances in a load-balanced setup.

Reported from Content url caching not invalidating on synchronized sites (episerver.com)

How to reproduce:

• Set up a load-balance environment with remote events.
• Upload an asset.
• Render link to asset in a view.
• Access the view from both nodes and click the link.
• Change the URL to the asset from one of the nodes.
• Refresh the view on the other node and click the link.