cc: Consolidate LayerList types.

cc/trees/damage_tracker_unittest.cc

Index: cc/trees/damage_tracker_unittest.cc
diff --git a/cc/trees/damage_tracker_unittest.cc b/cc/trees/damage_tracker_unittest.cc
index 95d02e892048328a38aa2ae32220e2e4d04fa255..d46a9a4b96650e372446c75607d4b9e823f29648 100644
--- a/cc/trees/damage_tracker_unittest.cc
+++ b/cc/trees/damage_tracker_unittest.cc
@@ -25,7 +25,7 @@ namespace {
 
 void ExecuteCalculateDrawProperties(
     LayerImpl* root,
-    std::vector<LayerImpl*>& render_surface_layer_list) {
+    LayerImplList& render_surface_layer_list) {
   int dummy_max_texture_size = 512;
 
   // Sanity check: The test itself should create the root layer's render
@@ -60,7 +60,7 @@ void EmulateDrawingOneFrame(LayerImpl* root) {
   //   3. resetting all update_rects and property_changed flags for all layers
   //      and surfaces.
 
-  std::vector<LayerImpl*> render_surface_layer_list;
+  LayerImplList render_surface_layer_list;
   ExecuteCalculateDrawProperties(root, render_surface_layer_list);
 
   // Iterate back-to-front, so that damage correctly propagates from descendant