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This is a reland of adb22130

Original change's description:
> NetworkService: Report data use of URLLoader to browser process
>
> When the requests complete, the total received and sent bytes are sent
> to browser process. ChromeDataUseMeasurement records metrics on Chrome-services
> data usage and updates metrics service.
>
> Subsequent CLs will record more metrics and also report this to data
> reduction proxy settings page.
>
> When NetworkService is disabled, DataUseMeasurement will get network
> delegate callbacks and record metrics.
>
> Bug: 808498
> Cq-Include-Trybots: luci.chromium.try:linux_mojo
> Change-Id: I113e480e4e1c67a65ff7461eb5ae2166a6b038d2
> Reviewed-on: https://chromium-review.googlesource.com/c/1274202
> Commit-Queue: rajendrant <rajendrant@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#600928}

TBR=kinuko@chromium.org

Bug: 808498
Change-Id: I341012581527fefeb6fd23ff16af4ed3a8373aa7
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/c/1290522
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: rajendrant <rajendrant@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601229}