Update url action container width to 48dp (phones only)

Set the url action container width to 48dp. The location bar has a
consistent 10dp start and end padding. When the url action container is
shown, the padding is built in to its actions, so the action container
itself uses a -10dp offset to properly align with the end of the
location bar.

Keeping consistent padding makes the omnibox focus/unfocus animation
simpler since we don't have to account for changing padding while
clipping.

BUG=914416

Change-Id: Ifbf4354102506b091bcc29c0ad933d2c3f301bfd
Reviewed-on: https://chromium-review.googlesource.com/c/1461542
Auto-Submit: Theresa <twellington@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631494}
7 files changed