Cleanup OmniboxContainerView.

Removes unused code from OmniboxContainerView and updates comments.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I107339a8fbab6ea49bf831b4a23ff4346fa69c6d
Reviewed-on: https://chromium-review.googlesource.com/1061467
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559870}
2 files changed