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This change adds logic to the extension installation flow that allows
for host permissions to be withheld by default if certain creation
flags are supplied.

Bug: 984069
Change-Id: I53aa71814b34bd19dc30a9b11b1dc5955bec1106
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759408
Commit-Queue: Tim Judkins <tjudkins@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705346}