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This enables the serial custom bindings that forward to the mojo serial
service behind the --enable-mojo-serial-service flag. This adds service
factory overrides to ServiceRegistrationManager for testing and updates
the serial api browsertest to test both serial implementations.

BUG=389016

Review URL: https://codereview.chromium.org/652313002

Cr-Commit-Position: refs/heads/master@{#301594}