Media Controls: Remove dead code and resources from the legacy controls

Bug: 884215
Change-Id: Ib285d8b1a92a7272f0b3ccf88e1f51ee56c0ba88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649177
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667816}
46 files changed