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This change updates the Native File System API permissions model to
consider the write guard content setting when determining permissions.
The write guard determines whether sites are allowed to ask for
permission to save to the original files selected by the user through
the Native File System API.

Bug: 985101
Change-Id: I3ee844ee634ed55b93a6b1e08cd9b8bdad67239b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707430Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Kamila Hasanbega <hkamila@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683447}