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Several DEPS entries were allowing dependencies on the internals of a
service. This CL tightens those DEPS down. Note that a couple are left:
this is intentional, as in those cases the services in question are
actually being embedded in the dependent.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I7e91f08559399997059c4c81dd7857e19c776175
Reviewed-on: https://chromium-review.googlesource.com/776695Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517422}