Settings cleanup: Swap neon-animatable elements with plain div.

Usage of neon-animatable is unnecessary now that neon-animation-pages has been
removed.

Bug: 902959
Change-Id: I7cbad2e8a2ba1f56234cc77ed9a40b4ef9aea314
Reviewed-on: https://chromium-review.googlesource.com/c/1343657
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615719}
20 files changed