Revert 244701 "Files.app: Blur the focus when window the state i..."

> Files.app: Blur the focus when window the state is changed.
> 
> Previously the focus is being on the gear menu even when the window state is
> changed. It causes the situation where the two gear and maximized buttons look
> focused. This CL add a call for the blur method when the window state is
> changed.
> 
> BUG=333196
> TEST=manually
> 
> Review URL: https://codereview.chromium.org/130563007

TBR=hirono@chromium.org

Review URL: https://codereview.chromium.org/168553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251584 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251584