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This reverts commit 581330a9.

Reason for revert: SimpleURLLoaderTest.OnUploadProgressCallback/3 is flaky

Original change's description:
> Port policy::UploadJobImpl to network::SimpleURLLoader
> 
> This change ports UploadJobImpl from net::URLFetcher to SimpleURLLoader.
> 
> Since this request does not make use of the response a new method has
> been added to SimpleURLLoader, DownloadToNull. This download mode still
> reads the response body from the network but does not save it anywhere.
> This is useful for requests which upload data and would otherwise have
> to specify an arbitrary |max_body_size|. A maximum may still be set if
> the caller wants to limit the amount of data transferred over the
> network.
> 
> Bug: 773295
> Cq-Include-Trybots: luci.chromium.try:linux_mojo
> Change-Id: Iee1fdc6f7406066ced8c91122e22cd51ddcb1c5f
> Reviewed-on: https://chromium-review.googlesource.com/1161551
> Commit-Queue: Reilly Grant <reillyg@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#581060}

TBR=pastarmovj@chromium.org,reillyg@chromium.org,mmenke@chromium.org

Change-Id: Ica09c85a12861d35efbdfd9a882d137bac6b9e56
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 773295, 872023
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/1166288Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581389}