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This code dates back from 2010 and doesn't accurately describe how full
screen works now.

Bug: None
Change-Id: I25a1ef21845251c432e6512fb5d55791d696bded
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2171440Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763843}