GitLab

The -openerOfTab: method of the TabModel wasn't used. This CL removes
it.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I79d219e52798a47da582d373b0b8e277e263a11e
Reviewed-on: https://chromium-review.googlesource.com/1122631Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572147}