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The chrome:// scheme is sensitive enough that any extension that can
have permission to run on a chrome:// page should have to specially
request access to that page. Prevent <all_urls> from implicitly matching
the chrome:// scheme.

Bug: 821858
Change-Id: Ie321749cd93ee4b51e89f501a9a25088d3df84c4
Reviewed-on: https://chromium-review.googlesource.com/993753
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561688}