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HID becomes a Supplement<Navigator> instead of an
ExecutionContextClient. This means it retains a references
to the Navigator, which is itself an ExecutionContextClient,
so it still has access to the ExecutionContext.

Change-Id: Ie1d789fb6588c816f39c5b0645d1973aee43caef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495503
Commit-Queue: Nate Chapin <japhet@chromium.org>
Auto-Submit: Nate Chapin <japhet@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820450}