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these structs are already in the media namespace, they dont need media::

Change-Id: I2844d35cf27d46b860b4969ea5e1960d522f3d0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339390Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795329}