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This can be used to unblock other features that depend on permissions
while the real permissions implementation is being worked on. It is
enabled by passing the --weblayer-fake-permissions flag.

Bug: 1025609
Change-Id: Ibafe00d47a0b8d84c99e0c1e3029d0a4a55d4922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1999063Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731650}