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This CL converts CastApplicationMediaInfoManager{Ptr, Request} in
chromecast to the new Mojo type

Bug: 955171
Change-Id: I3b60c6e76e166ede239df86359959a4523f60d75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871879
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711961}