Are you sure about these tags? As far as I (well, code search) can see NetworkHintsMessageFilter is only ever instantiated in chromecast/browser/cast_content_browser_client.cc

Note to whomever does the migration on this one:
This resolve request is setting the |is_speculative| flag with a comment that that will reduce priority.  That flag has no effect on priority (only logging and observers), so we should check if we want reduced priority and actually set IDLE accordingly.

jam/cduvall/ericorth, can you please comment on #4. I also did a cs and confirms comment#4 is correct. If that's the case, this probably won't block windows canary.

Thanks for bringing that up Maks.

If the code is only ever used in chromecast, agreed that this is not a canary blocker.

CL merged:
https://chromium-review.googlesource.com/c/chromium/src/+/1187507

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/624207a7c1a366dd2f80c05dcf6af0ad074c5f58

commit 624207a7c1a366dd2f80c05dcf6af0ad074c5f58
Author: Jun Cai <juncai@chromium.org>
Date: Tue Sep 04 18:07:08 2018

Network Service: Convert network_hints_message_filter.cc to mojo host resolver

Bug:  874654 
Change-Id: I096673342b280bad76ba856d6ee01c5a453bc1d8
Reviewed-on: https://chromium-review.googlesource.com/1187507
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588585}
[modify] https://crrev.com/624207a7c1a366dd2f80c05dcf6af0ad074c5f58/chromecast/browser/cast_content_browser_client.cc
[modify] https://crrev.com/624207a7c1a366dd2f80c05dcf6af0ad074c5f58/components/network_hints/browser/BUILD.gn
[modify] https://crrev.com/624207a7c1a366dd2f80c05dcf6af0ad074c5f58/components/network_hints/browser/DEPS
[modify] https://crrev.com/624207a7c1a366dd2f80c05dcf6af0ad074c5f58/components/network_hints/browser/network_hints_message_filter.cc
[modify] https://crrev.com/624207a7c1a366dd2f80c05dcf6af0ad074c5f58/components/network_hints/browser/network_hints_message_filter.h