add chromium to favorites

schemas-override/org.gnome.shell.gschema.override

@@ -1,2 +1,3 @@
 [org.gnome.shell]
+favorite-apps=['chromium-browser.desktop', 'evolution.desktop', 'org.gnome.Nautilus.desktop', 'org.gnome.Software.desktop']
 enabled-extensions=['background-logo@fedorahosted.org', 'appindicatorsupport@rgcjonas.gmail.com', 'dash-to-panel@jderose9.github.com', 'desktop-icons@gnome-shell-extensions.gcampax.github.com', 'arcmenu@arcmenu.com', 'no-overview@fthx']