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This CL converts SerialPort{Ptr, Request} in services, extensions
and content to the new Mojo type, and uses
pending_receiver<SerialPort> in serial.mojom.

Bug: 955171
Change-Id: I6911df8bd057e0e7e8fa81ce00273c4cd049de6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810441
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698448}