CL: https://chromium-review.googlesource.com/c/chromium/src/+/1136518

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2

commit c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Thu Aug 09 00:06:43 2018

Migrate components/metrics/net to network::SimpleURLLoader

URLFetcher will stop working with advent of Network Service, and
SimpleURLLoader is the replacement API for most clients.
This CL migrates NetMetricsLogUploader away from URLFetcher.

Note that previously, code was written like:

  URLFetcher* fetcher = ...;
  if (condition) {
    fetcher->SetUploadData(foo)
    fetcher->AddExtraRequestHeader(blah)
    fetcher->AddExtraRequestHeader(bleh)
  } else {
    fetcher->SetUploadData(foo2)
    fetcher->AddExtraRequestHeader(blah2)
  }

... whereas now, given how SimpleURLLoader and ResourceRequest APIs
are designed, code needed to change to something like:

  ResourceResource request = ...;
  if (condition) {
    request->headers.SetHeader(blah)
    fetcher->headers.SetHeader(bleh)
  } else {
    fetcher->headers.SetHeader(blah2)
  }
  SimpleURLLoader loader = ctor(std::move(request),... );
  if (condition) {
    loader->AttachStringForUpload(foo)
  } else {
    loader->AttachStringForUpload(foo2)
  }

Bug:  844938 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia97f065eb22e65e32066d45010b909b2cab9d5fb
Reviewed-on: https://chromium-review.googlesource.com/1136518
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#581727}
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/chrome/browser/metrics/chrome_metrics_service_client.cc
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/chromecast/browser/cast_browser_main_parts.cc
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/chromecast/browser/metrics/cast_metrics_service_client.cc
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/chromecast/browser/metrics/cast_metrics_service_client.h
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/components/metrics/BUILD.gn
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/components/metrics/net/DEPS
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/components/metrics/net/net_metrics_log_uploader.cc
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/components/metrics/net/net_metrics_log_uploader.h
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/components/metrics/net/net_metrics_log_uploader_unittest.cc
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.mm
[modify] https://crrev.com/c50aca7d32a8f613ff84ef0c90a7b560e1f9cbe2/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8d5f7bbac136173a500237c0c200d9ed81f83315

commit 8d5f7bbac136173a500237c0c200d9ed81f83315
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Wed Sep 19 18:40:25 2018

fixup! Migrate components/metrics/net to network::SimpleURLLoader

Follow up of [1], that introduces
TestURLLoaderFactory::GetPendingRequest.

[1] https://crrev.com/c/1234133

TBR=isherman@chromium.org

BUG= 844938 

Change-Id: I59b19774462957fa71e09759f0154471f2a6c8f3
Reviewed-on: https://chromium-review.googlesource.com/1234634
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#592491}
[modify] https://crrev.com/8d5f7bbac136173a500237c0c200d9ed81f83315/components/metrics/net/net_metrics_log_uploader_unittest.cc