fix #1398 Removing isWindowsPhone in aria.utils.Dom.getViewportSize
fix #1398 Removing isWindowsPhone in aria.utils.Dom.getViewportSize

This fixes a regression on IE 7 and 8 introduced by commit 84ffd08ec7f10a8dcaeb6bad6a8375ae95ad60e4
because aria.core.Browser.isWindowsPhone is not correctly implemented
(to be fixed later).

benouat/ariatemplates,ariatemplates/ariatemplates,ymeine/ariatemplates,simonarbuckle/ariatemplates,benouat/ariatemplates,fcapa/aria,fbasso/ariatemplates,divdavem/ariatemplates,ariatemplates/ariatemplates,vcarle/ariatemplates,mlaval/ariatemplates,fcapa/aria,ymeine/ariatemplates,ymeine/ariatemplates,ariatemplates/ariatemplates,mlaval/ariatemplates,benouat/ariatemplates,vcarle/ariatemplates,fbasso/ariatemplates,fcapa/aria,vcarle/ariatemplates,fbasso/ariatemplates,mlaval/ariatemplates,simonarbuckle/ariatemplates,divdavem/ariatemplates,simonarbuckle/ariatemplates,divdavem/ariatemplates