Merge pull request #3588 from atom/fix-fullscreen-crash
authorCheng Zhao <zcbenz@gmail.com>
Thu, 26 Nov 2015 06:10:17 +0000 (14:10 +0800)
committerCheng Zhao <zcbenz@gmail.com>
Thu, 26 Nov 2015 06:10:17 +0000 (14:10 +0800)
Clears the delegate when window is going to be closed


Trivial merge