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This CL converts CameraHalServer{Ptr, Request} in media to the new
Mojo type, and uses pending_remote<CameraHalServer> in
cros_camera_service.mojom.

Bug: 955171
Change-Id: Ice2749a91a90e6e0da0c8211209aa7f3e0a72db0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863022
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707279}