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StateFullscreen and TabletMode is no longer needed in chrome.

Bug: 733662
Change-Id: Ib25f89745e989042e321c597fe62ded72bc0cffa
Reviewed-on: https://chromium-review.googlesource.com/884376
Commit-Queue: Jiaquan He <hejq@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531734}