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This CL cleans up old Mojo types for media::Renderer using
PendingReceiver and SelfOwnedReceiverRef.

Bug: 955171
Change-Id: Ibbd108219a3f3eac175e4122376f1a78ed976aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886070Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#711112}