GitLab

There are a few further cleanups still to land, but this removes most of the
code needed to compute/draw infobar arrows, as well as code that is "fallout"
from having them.

Now that arrows are never drawn, all this complexity is unnecessary.

BUG=none
TEST=none

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib8d9f83c56e98321b8a7f65e5503d849cd2e0d9d
Reviewed-on: https://chromium-review.googlesource.com/991056Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548210}