Bug 1568700 [wpt PR 18062] - [Native File System] Remove Writable File Stream code...

Bug 1568700 [wpt PR 18062] - [Native File System] Remove Writable File Stream code, a=testonly

Automatic update from web-platform-tests
[Native File System] Remove Writable File Stream code

Removing Writable File Stream code for now until we decide what we want
to do as an API using Writable Streams.

As currently designed, the API does not take into account SafeBrowsing
and Quarantine checks.

Bug: 986865
Change-Id: Ib5bb922359cae1fb8267cd7123345bab6de78090
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717590
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Olivier Yiptong <oyiptong@chromium.org>
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680866}

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wpt-commits: f88d17122816b73fe02ea3da19021f08b67a6743
wpt-pr: 18062