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This CL fixes some comments in permission_context_base.h which are
outdated or incorrect, and moves PermissionDecided from protected to
private.

Change-Id: I62ed3d82f46dc8680656c6072d9e45f4585197dd
Reviewed-on: https://chromium-review.googlesource.com/776493Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517757}