Fix to way we identify the active window. This deals with XFCE which doesn't set the property correctly. Bug=31971 Test=Run Chrome under the XFCE WM and ensure that inactive windows titles are      light blue
Fix to way we identify the active window. This deals with XFCE which
doesn't set the property correctly.
Bug=31971
Test=Run Chrome under the XFCE WM and ensure that inactive windows titles are
     light blue

Review URL: http://codereview.chromium.org/550019

git-svn-id: http://src.chromium.org/svn/trunk/src@36073 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b854c0b7086ad01d3dbd5876850af5f938aa61cf
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser