Backout changeset 4e29b12a5d25 (bug 770096) because DLBI is being backed out

layout/base/FrameLayerBuilder.cpp

@@ -2791,10 +2791,6 @@ FrameLayerBuilder::DrawThebesLayer(ThebesLayer* aLayer,
     // so 'entry' could become invalid.
   }
 
-  if (!containerLayerFrame) {
-    return;
-  }
-
   ThebesDisplayItemLayerUserData* userData =
     static_cast<ThebesDisplayItemLayerUserData*>
       (aLayer->GetUserData(&gThebesDisplayItemLayerUserData));