The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e33edf124e533a52021e18073a20a47a84f4126e

commit e33edf124e533a52021e18073a20a47a84f4126e
Author: Mark Pilgrim <pilgrim@chromium.org>
Date: Thu Jun 28 17:03:25 2018

Migrate DataReductionProxyPingbackClientImpl to SimpleURLLoader

Bug:  855620 

Change-Id: Id4da3e42581147261f706c15f3649a38fad52ff1
Reviewed-on: https://chromium-review.googlesource.com/1117031
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571167}
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/previews/previews_infobar_delegate_unittest.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/previews/previews_infobar_tab_helper_unittest.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/profiles/profile_impl_io_data.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/chrome/browser/renderer_context_menu/render_view_context_menu_unittest.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/components/data_reduction_proxy/content/browser/BUILD.gn
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/components/data_reduction_proxy/content/browser/DEPS
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/components/data_reduction_proxy/content/browser/data_reduction_proxy_pingback_client_impl.cc
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/components/data_reduction_proxy/content/browser/data_reduction_proxy_pingback_client_impl.h
[modify] https://crrev.com/e33edf124e533a52021e18073a20a47a84f4126e/components/data_reduction_proxy/content/browser/data_reduction_proxy_pingback_client_impl_unittest.cc

pilgrim@ has an in-progress CL which I will pick up soon: https://chromium-review.googlesource.com/c/chromium/src/+/1122697

@reillyg: are you working on this, or should we take over?

I haven't started work on it yet. It's all yours.

What's the status of this migration? It would be great to get this done soon as we are going to start migration data_reduction_proxy to network service very soon. Also looks like there are separate bugs for each file that needs to be migrated in the data_reduction_proxy directory:  issue 879777 ,  issue 879783 , and  issue 879784 .

I am no longer working on that. The work was suspended as the priority was the Windows Canary blockers.

Apart from that, if I am not wrong there were some decissions to be made before going on with the migration. I think John could provide more details here. Adding him to Cc.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/357996d73872c84c9687882ca1592e657944f3b5

commit 357996d73872c84c9687882ca1592e657944f3b5
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Tue Oct 09 19:19:38 2018

Remove orphan histogram DataReductionProxy.ConfigService.SentVariationHeaders

This is a driven-by / preparation CL to migration
DataReductionProxyConfigServiceClient to use SimpleURLLoader (over
URLFetcher).

As per tbansal@ comment in [1], this histogram is not useful anymore.

[1] https://crrev.com/c/1271175#message-d675bd68a0cc6f93ba5211900d9ea6cdfee09fcb

BUG= 855620 

Change-Id: I536e1760bd2d410401ebe68549fa39eab7a8344c
Reviewed-on: https://chromium-review.googlesource.com/c/1271495
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#598032}
[modify] https://crrev.com/357996d73872c84c9687882ca1592e657944f3b5/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.cc
[modify] https://crrev.com/357996d73872c84c9687882ca1592e657944f3b5/tools/metrics/histograms/histograms.xml

I am closing this bug as fixed since the 3 blockers are also fixed.

Please reopened if there is more work to be done.