It certainly looks to be canary blocking on ChromeOS...I'm not rightly sure about other platforms.  Let's be cautious here.

hey ... can we see if this is also blocks Windows?

wip: https://chromium-review.googlesource.com/c/chromium/src/+/1138795

I'd assume that this is applicable to OS-Windows. Adding back the flag.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6246ea83f3bd5fc7c814b9157de7578bb3999aed

commit 6246ea83f3bd5fc7c814b9157de7578bb3999aed
Author: Maks Orlovich <morlovich@chromium.org>
Date: Wed Aug 08 14:19:10 2018

S13n: Port oauth2_api_call_flow to SimpleURLLoader

URLFetcher will stop working in the browser process with
advent of Network Service, and SimpleURLLoader is the replacement
API for most clients.

Bug:  865015 
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I248ff39534aeab11be4a60826edf7e89256ad2dc
Reviewed-on: https://chromium-review.googlesource.com/1138795
Reviewed-by: Stuart Langley <slangley@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581556}
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chrome/browser/chromeos/cryptauth/chrome_cryptauth_service.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chrome/browser/chromeos/drive/drive_integration_service.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chrome/browser/extensions/api/identity/identity_apitest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chrome/browser/extensions/api/identity/identity_get_auth_token_function.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chrome/browser/profiles/profile_impl.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/components/drivefs/BUILD.gn
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/components/drivefs/drivefs_host.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/components/drivefs/drivefs_host.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/components/drivefs/drivefs_host_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/BUILD.gn
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/device_sync_impl.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/device_sync_impl.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/device_sync_service.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/device_sync_service.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/device_sync_service_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/public/cpp/BUILD.gn
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/chromeos/services/device_sync/public/cpp/device_sync_client_impl_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/DEPS
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_api_call_flow.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_api_call_flow.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_api_call_flow_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_client_impl.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_client_impl.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/components/cryptauth/cryptauth_client_impl_unittest.cc
[add] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/extensions/shell/browser/api/identity/DEPS
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/extensions/shell/browser/api/identity/identity_api.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/extensions/shell/browser/api/identity/identity_api_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/BUILD.gn
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/gaia_auth_fetcher_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_access_token_fetcher_impl_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_api_call_flow.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_api_call_flow.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_api_call_flow_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_mint_token_flow.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_mint_token_flow.h
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_mint_token_flow_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/oauth2_token_service_unittest.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/gaia/ubertoken_fetcher_unittest.cc
[add] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/test/DEPS
[add] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/google_apis/test/run_all_unittests.cc
[modify] https://crrev.com/6246ea83f3bd5fc7c814b9157de7578bb3999aed/services/network/test/test_utils.cc

 Issue 826780  has been merged into this issue.