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Currently we assume that there will only be at most one of each
PermissionType in a call to PermissionServiceImpl::RequestPermissions.
However we never actually verify this and if it turns out to be true, it
triggers a use-after-free in PermissionContextBase. Verify that this is
the case otherwise call ReceivedBadMessage.

Bug: 839197
Change-Id: I1270486ed942f20422a068c686c46d02e5f10da2
Reviewed-on: https://chromium-review.googlesource.com/1053333Reviewed-by: Timothy Loh <timloh@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558569}