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NavigatorBase is a newly-added base class for Navigator and
WorkerNavigator. Making Serial a Supplement of NavigatorBase
allows a single class to handle all of the work of exposing the
navigator.serial getter for both windows and workers, and
greatly reduces boilerplate.

Bug: 1147612
Change-Id: If8bb50bdb9729b106be20f0ee228233560f09511
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537920
Commit-Queue: Nate Chapin <japhet@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Auto-Submit: Nate Chapin <japhet@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827501}