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With this CL, most of Cros API starts to support multiple receivers.
AshChromeService and LacrosChromeService are exceptions.

Bug: 1148448
Test: Build and run Lacros on a DUT.
Change-Id: I1d1a0be111108ae15657d81ea747750a760bd2f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624323Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842869}