Some of the tests invoke system fullscreen. This is no safe for sharding.

Either:
1) The test suite should become an interactive_ui_test
2) It should use: ScopedFakeNSWindowFullscreen

Assigning to alexmos@ based on:
"""
commit 1f7eac4a2affa46f6c7eb53aba6a5baa72375e4c
Author: alexmos <alexmos@chromium.org>
Date:   Wed May 25 16:04:55 2016 -0700

    Reland: Add support for entering/exiting HTML fullscreen from OOPIFs.
"""