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This CL converts AudioDecoderClient{AssociatedPtr,
AssociatedPtrInfo} and AssociatedReceiver<AudioDecoderClient> in
media to the new Mojo type, and uses
pending_associated_remote<AudioDecoderClient> in audio_decoder.mojom.

Bug: 955171
Change-Id: I0639e2bbbd97b0f5aebc958a739dae4e1769240f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865162
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#707290}