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This CL removes the code that created the current time scrubbing popup
in the modern media controls. It also changes the CSS to show the
button panel during scrubbing.

Bug: 817591, 816442
Change-Id: I8ad2bd5a634f0706884ca6648a36f506af620c23
Reviewed-on: https://chromium-review.googlesource.com/964904Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543746}