Revert "[Cast MRP] Implement capabilities filtering."

This reverts commit 5c4c420606ef2166f64840d1ceceab21bf1929ff.

Reason for revert: Capabilities filtering broke Cast SDK integration

Original change's description:
> [Cast MRP] Implement capabilities filtering.
> 
> In addition to app availability, the CastAppDiscoveryService will now
> check the required capabilities in the MediaSource against the
> capabilities supported by a sink. A sink is only returned if both
> conditions are satisfied.
> 
> Bug: 809249
> Change-Id: I5c6f3685db44b28560c575892637117e9ad8d711
> Reviewed-on: https://chromium-review.googlesource.com/1089461
> Commit-Queue: Derek Cheng <imcheng@chromium.org>
> Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#566191}

TBR=imcheng@chromium.org,takumif@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 809249
Change-Id: Ic8533a927bfbb30b7f60dbdb7e7e1a7cde50e102
Reviewed-on: https://chromium-review.googlesource.com/1106500
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568914}
6 files changed