cc: Rename LayerImpl::render_surface to GetRenderSurface

cc/layers/layer_iterator_unittest.cc

Index: cc/layers/layer_iterator_unittest.cc
diff --git a/cc/layers/layer_iterator_unittest.cc b/cc/layers/layer_iterator_unittest.cc
index ea51d6fd73504508dc3acc1fa7eeb9f209cf258f..4b93ea6e7556b842a0f991744f9cdefa07118510 100644
--- a/cc/layers/layer_iterator_unittest.cc
+++ b/cc/layers/layer_iterator_unittest.cc
@@ -57,7 +57,8 @@ void ResetCounts(LayerImplList* render_surface_layer_list) {
        ++surface_index) {
     TestLayerImpl* render_surface_layer = static_cast<TestLayerImpl*>(
         render_surface_layer_list->at(surface_index));
-    RenderSurfaceImpl* render_surface = render_surface_layer->render_surface();
+    RenderSurfaceImpl* render_surface =
+        render_surface_layer->GetRenderSurface();
 
     render_surface_layer->count_representing_target_surface_ = -1;
     render_surface_layer->count_representing_contributing_surface_ = -1;