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This CL converts DemuxerStreamPtr and InterfaceRequest<T> in media to
the new Mojo type.

Bug: 955171
Change-Id: Ia10bed44d9133f3e15ad16d724e95db6c6e945ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882258
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#710196}