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This CL converts AudioProcessorControls{Ptr, Request} in content to
the new Mojo types.

Bug: 955171
Change-Id: I4c5f0a4f08e6d0f92750811dbd40a90cf6f0f622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786362Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#694694}