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This CL removes the min-height CSS properties for audio elements and
video elements acting as audio elements. We had these rules to handle
the width/height-zero elements in the MediaDocument, but we have
changed how the MediaDocument sizing works, so they're no longer
needed.

Bug: 842900
Change-Id: I050aba4786f84754843ee611ead1dabe220381cb
Reviewed-on: https://chromium-review.googlesource.com/1239725Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593621}