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Adds both the convenience class for creating new services for the
|CfMServiceContext| as well as the nominal primary mojom broker service
|mojom::CfmBrowser|. This class indicates to |CfmServiceContext| the
lifespan of chromium.

BUG=chromium:1105567, b:165864612
TEST=`autoninja -C out/Default/ chrome/test:unit_tests && \
     xvfb-run ./out/Default/unit_tests --gtest_filter=CfmServiceAdaptorTest.*`

Cq-Depend: chromium:2419799, chromium:2436990
Change-Id: I754cfa99e5137b792204789b4f4847bd19e7536c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429424
Commit-Queue: Kyle Williams <kdgwill@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Auto-Submit: Kyle Williams <kdgwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814757}