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Update lock screen media controls layout and icons.

Bug: 1015133
Change-Id: I288f4826e490c18d40217ddbfd4305b25fd8c514
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865717Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707402}