cc: Clean up iterator template to only take 1 parameter.

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index fc3fb94c4c6be68210018c7f843921a7d5c2143e..19136dd268cb92bd8a23fcc89b9690ad8a4e6a0e 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -2339,12 +2339,8 @@ LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPoint(
     const LayerImplList& render_surface_layer_list) {
   LayerImpl* found_layer = NULL;
 
-  typedef LayerIterator<LayerImpl,
-                        LayerImplList,
-                        RenderSurfaceImpl,
-                        LayerIteratorActions::FrontToBack> LayerIteratorType;
+  typedef LayerIterator<LayerImpl> LayerIteratorType;
   LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
-
   for (LayerIteratorType
            it = LayerIteratorType::Begin(&render_surface_layer_list);
        it != end;