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This CL converts HidConnectionClientRequest in services and content
to the new Mojo type.

Bug: 955171
Change-Id: I993ee59359700e0cd87db38d777db3df1a288a83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804708Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#697126}