This CL a partial revert of https://crrev.com/c/1771638 so that
the removed vector drawable can be used on KitKat instead of
9-patch drawable. KitKit doesn't seem to handle scaling 9-patch
drawable well. Using the vector drawable gets around the issue.

Bug: 993506
Change-Id: Id7b8db13ea2e19e3e3e3fed83b42c84cea9a95d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826748
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701008}