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Implements a bare-bones version that mostly reuses code from
RealTimeUrlLookupServiceBase without doing the work to derive from a
base class. This will follow-up in a different CL. For this reason some
of the callbacks have unused parameters, to make implementing a base
common class less painful.

Design doc: go/permission-predictions-client-doc

Bug: 1138595
Change-Id: Idc26e836fba565cf42f796ee3a5b20bc8d61f53f
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513656
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Ravjit Singh Uppal <ravjit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826868}