Strip Interface class of most of its logic, make it all about Module exports

src/ast-numbering.cc

Index: src/ast-numbering.cc
diff --git a/src/ast-numbering.cc b/src/ast-numbering.cc
index a2bc65827d9ded4afdc131c0467d2dab6d0006f4..ea25ad8bbca4722f0deeb89be9f40a1d77004757 100644
--- a/src/ast-numbering.cc
+++ b/src/ast-numbering.cc
@@ -190,13 +190,6 @@ void AstNumberingVisitor::VisitImportDeclaration(ImportDeclaration* node) {
 }
 
 
-void AstNumberingVisitor::VisitModuleVariable(ModuleVariable* node) {
-  IncrementNodeCount();
-  DisableOptimization(kModuleVariable);
-  Visit(node->proxy());
-}
-
-
 void AstNumberingVisitor::VisitModulePath(ModulePath* node) {
   IncrementNodeCount();
   DisableOptimization(kModulePath);