cc: Remove support for disabling non-root render surfaces.

cc/trees/property_tree_builder.cc

Index: cc/trees/property_tree_builder.cc
diff --git a/cc/trees/property_tree_builder.cc b/cc/trees/property_tree_builder.cc
index 375051ac04087affe87b921490b34eb9c0e83702..3330fe5fedc4b0ab7124e63da99a5f5fb42463ce 100644
--- a/cc/trees/property_tree_builder.cc
+++ b/cc/trees/property_tree_builder.cc
@@ -400,11 +400,6 @@ void AddClipNodeIfNeeded(const DataForRecursion<LayerType>& data_from_ancestor,
     data_for_children->apply_ancestor_clip = true;
   }
 
-  // Without surfaces, all non-viewport clips have to be applied using layer
-  // clipping.
-  bool layers_are_clipped_when_surfaces_disabled =
-      layer_clips_subtree || parent->layers_are_clipped_when_surfaces_disabled;
-
   // Render surface's clip is needed during hit testing. So, we need to create
   // a clip node for every render surface.
   bool requires_node = layer_clips_subtree || created_render_surface;
@@ -412,8 +407,6 @@ void AddClipNodeIfNeeded(const DataForRecursion<LayerType>& data_from_ancestor,
   if (!requires_node) {
     data_for_children->clip_tree_parent = parent_id;
     DCHECK_EQ(layers_are_clipped, parent->layers_are_clipped);
-    DCHECK_EQ(layers_are_clipped_when_surfaces_disabled,
-              parent->layers_are_clipped_when_surfaces_disabled);
   } else {
     LayerType* transform_parent = data_for_children->transform_tree_parent;
     if (PositionConstraint(layer).is_fixed_position() &&
@@ -453,8 +446,6 @@ void AddClipNodeIfNeeded(const DataForRecursion<LayerType>& data_from_ancestor,
     }
     node.resets_clip = has_unclipped_surface;
     node.layers_are_clipped = layers_are_clipped;
-    node.layers_are_clipped_when_surfaces_disabled =
-        layers_are_clipped_when_surfaces_disabled;
 
     data_for_children->clip_tree_parent =
         data_for_children->property_trees->clip_tree.Insert(node, parent_id);