Revert "Protect hildon_window_event_filter() with gdk_threads_enter()"
Revert "Protect hildon_window_event_filter() with gdk_threads_enter()"

This reverts commit afd2ab587afda9b1f19316aeb79b8e141d9fd426, since it
is causing a deadlock

android-808/libhildon,Cordia/libhildon,Cordia/libhildon,android-808/libhildon,Cordia/libhildon,android-808/libhildon