Is it possible to add more details to this bug? It's not clear what it is about. Migrate WebrtcLogUploader to what?

Yeah, sorry, a team member mass-created these bugs at one point. This is part of the Mojo-ification effort, migrating consumers of net::URLFetcher to the new network::SimpleURLLoader.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3cb2e28e557c5abc25e4797b65dfbb6cb0e386a3

commit 3cb2e28e557c5abc25e4797b65dfbb6cb0e386a3
Author: Mark Pilgrim <pilgrim@chromium.org>
Date: Mon Jun 18 18:16:52 2018

Migrate WebRtcLogUploader to SimpleURLLoader

Bug:  844914 
Change-Id: Ie38db098ec0e540b4425a42500c43263ed57119f
Reviewed-on: https://chromium-review.googlesource.com/1102492
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568076}
[modify] https://crrev.com/3cb2e28e557c5abc25e4797b65dfbb6cb0e386a3/chrome/browser/media/webrtc/webrtc_log_uploader.cc
[modify] https://crrev.com/3cb2e28e557c5abc25e4797b65dfbb6cb0e386a3/chrome/browser/media/webrtc/webrtc_log_uploader.h