Refreshed during triage.

Most of our recent files and classes are following this naming convention (e.g., warmup_url_fetcher, network_properties_manager). I am not sure if we will ever get around to renaming the existing classes and files. This seems low priority and probably not worth doing at the cost of losing part of the git history in the renaming process.

I am going to close this. Please feel free to reopen, if somebody feels otherwise.