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This CL converts Camera3CallbackOps{Ptr, Request} in media to the
new Mojo type, and uses pending_remote<Camera3CallbackOps> in
camera3.mojom.

Bug: 955171
Change-Id: I2653e925a82b1c3c17d8676f3d0c13e1418676b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862442
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707874}