cmumford@, can you prioritize this one first? as this is a blocker for canary :)

Review: https://crrev.com/c/1187339

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cec94b1d1a50a95be266971a23758960a32a34b5

commit cec94b1d1a50a95be266971a23758960a32a34b5
Author: Chris Mumford <cmumford@chromium.org>
Date: Fri Aug 24 19:45:41 2018

Switch chrome_cleaner_fetcher_win.cc to use SimpleURLLoader.

This is a switch from using net::URLFetcher to network::SimpleURLLoader
as part of the network serviceification effort.

Bug:  876470 
Change-Id: Ib47afb4a3a3b10735204fd5fdf131844d3107d51
Reviewed-on: https://chromium-review.googlesource.com/1187339
Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585947}
[modify] https://crrev.com/cec94b1d1a50a95be266971a23758960a32a34b5/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_controller_impl_win.cc
[modify] https://crrev.com/cec94b1d1a50a95be266971a23758960a32a34b5/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_fetcher_win.cc
[modify] https://crrev.com/cec94b1d1a50a95be266971a23758960a32a34b5/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_fetcher_win.h
[modify] https://crrev.com/cec94b1d1a50a95be266971a23758960a32a34b5/chrome/browser/safe_browsing/chrome_cleaner/chrome_cleaner_fetcher_win_unittest.cc