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This CL converts media::mojom::RendererClient from
media/mojo/mojom/renderer.mojom to new Mojo types using
AssociatedReceiver, PendingAssociatedReceiver, and
PendingAssociatedRemote.

Bug: 955171
Change-Id: Icc9a50f32b17b2e94ba075844e7da0b99a5f9791
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903174Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#714058}