Use surface contents scale from effect tree (3)

cc/trees/property_tree.cc

Index: cc/trees/property_tree.cc
diff --git a/cc/trees/property_tree.cc b/cc/trees/property_tree.cc
index e4e0636f442384eddae6e9adaea57477a2fcbd6c..e985d75f44b180278e31c532841748655da556fc 100644
--- a/cc/trees/property_tree.cc
+++ b/cc/trees/property_tree.cc
@@ -172,12 +172,6 @@ bool TransformTree::ComputeTransformWithDestinationSurfaceContentsScale(
   return success;
 }
 
-bool TransformTree::Are2DAxisAligned(int source_id, int dest_id) const {
-  gfx::Transform transform;
-  return ComputeTransform(source_id, dest_id, &transform) &&
-         transform.Preserves2dAxisAlignment();
-}
-
 bool TransformTree::NeedsSourceToParentUpdate(TransformNode* node) {
   return (source_to_parent_updates_allowed() &&
           node->parent_id != node->source_node_id);