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These classes were in //chrome, making them inaccessible to tests that
are not also in //chrome due to dependency issues. This CL moves them to
//chromeos/services/nearby, alongside their associated .mojom
definitions. These mocks are used in a follow-up CL to implement tests.

This CL also initializes a SharedRemote associated with these classes
and a getter to retrieve a reference to the SharedRemote.

Bug: 1130069
Change-Id: I1bb87403a64a17c5b6f4da1b9f9daaf3ce414d64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464844Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816606}