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Currently, the install warning message for a host with an invalid scheme
explicitly mentions the "permissions" key even if the host is specified
inside optional_permissions or host_permissions. This CL un-hardcodes
warning's message so it can specify other manifest keys.

Bug: 1136993
Change-Id: I52eb1e00fd6d357742018c2f25f256237cd25483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473584
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817744}