Bug 1077609 - [Keyboard] When app permissions page asks user to add
keyboard, home button does not take user to home screen.
 - Hide IME setup and list dialog when home button is pressed.
Merge pull request #24935 from RudyLu/winMgr/bug1077609

Bug 1077609 - [Keyboard] When app permissions page asks user to add
r=timdream.