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This CL has no intended behavior changes. It stabilizes the crosapi and
hid mojoms, which were intended to be stable but were incorrectly not
marked with the [Stable] tag.

Change-Id: I31d0e67632c7ce7a6a9726539c5449664a0669de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417054
Auto-Submit: Erik Chen <erikchen@chromium.org>
Commit-Queue: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808063}