GitLab

Every use of LocationBarButton aside from the omnibox incognito icon
were setting their layout_gravity explicitly, so having
LocationBarButton have a gravity of end wasn't an issue elsewhere.
This brings back the original LocationBarButton and creates the
LocationBarActionButton for action buttons instead.

TBR=yusufo@chromium.org

Bug: 831535
Change-Id: If78e27c32c09d0a462a15503ab73f89788d603bd
Reviewed-on: https://chromium-review.googlesource.com/1008169
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550219}