Remove non-modern code from AccessibilityTabModelWrapper

Bug: 876051

Change-Id: I7826a815732a64d4b728be2f6b8565c5259f974c
Reviewed-on: https://chromium-review.googlesource.com/1217585
Commit-Queue: Pedro Amaral <amaralp@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590074}
1 file changed