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This gets rid of the redundant ConfirmDirectoryReadAccess method,
and instead just requests read access on the corresponding permission
grant instead. In the future this will make it easier to support a
single prompt for getting access to a writable directory, instead
of the current two separate prompts.

To do this, also adds an extra flag to the
NFSPermissionGrant::RequestPermission method to indicate if this
particular permission requests requires user activation.

Bug: 1115632
Change-Id: Ie3980867d162e16723569a0fd36f27323d2700ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341214Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797406}