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This CL converts CameraHalDispatcherRequest and
BindingSet<CameraHalDispatcher> in media to the new Mojo type.

Bug: 955171
Change-Id: I2345178fc387d0db1b2b3b43d787d439ac517404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863090
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707311}