Revert 243938 "Enable all ESC-Fullscreen tests (Chrome Apps) for..."

> Enable all ESC-Fullscreen tests (Chrome Apps) for all platforms.
> 
> There were three issues:
> 1. a silly bug in the fullscreen change check;
> 2. there was no guarantee that the window would be actually focused;
> 3. changing the fullscreen state might come with an animation during which key events will not be received.
> 
> Note that 2 and 3 are a problem on MacOS only.
> 
> BUG=None
> 
> Review URL: https://codereview.chromium.org/116023002

TBR=mlamouri@chromium.org

Review URL: https://codereview.chromium.org/131343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243955 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243955