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According to Download.IOSDownloadedFileStatusCode UMA metric there is
non-trivial number of download failures with 405 http code (Method Not
Allowed). This is because DownloadTask always creates NSURLTask with
GET HTTP method regardless of the original HTTP method in the request.

This CL adds support for POST request, because this is likely the
easiest fix for the problem (I would be surprised if PUT and DELETE
methods are used for downloads). We can add support for all HTTP
methods later if necessary.

Bug: 1030164
Change-Id: Ic3023fee44c580af7e4540b9de15ca957d43d047
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948283
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721118}