Don't display the file select dialog from invisible windows.

      See more details from http://code.google.com/p/chromium/issues/detail?id=58319.

BUG=58319
TEST=none

Review URL: http://codereview.chromium.org/3832005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63647 0039d316-1c4b-4281-b951-d872f2087c98