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

Bug: 955171
Change-Id: I3184cb445f9211033af7176c9d97352b2edb849f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862913
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>
Cr-Commit-Position: refs/heads/master@{#707753}