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If an extension uses all hosts (e.g. by specifying <all_urls> in host
permissions), an API permission kHostsAll is created somewhere down the
line. This permission is used to provide a permission message, but
kHostsAll is not added as an API permission when checking if there is
a privilege increase between a set of granted vs requested API
permissions. As a result, an extension can be reported for a privilege
increase even when it shouldn't.

This CL fixes this issue by adding kHostsAll for privilege increase
checks to make sure the right messages are compared.

Bug: 1014505, 512344
Change-Id: Ie20045c6760b50dae5949b9cceaf10467fcf1534
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042387Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741542}