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This CL takes layout tests out of media/controls/modern and puts them
directly into media/controls. We no longer support legacy controls so
there's no need to differentiate between the two.

Bug: 884215
Change-Id: I5eb8f5e4db9c5a5db675703c153fefdc34d7b145
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1655982Reviewed-by: Becca Hughes <beccahughes@google.com>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668501}