Revert of Separate Scope into DeclarationScope and Scope

src/ast/ast-traversal-visitor.h

Index: src/ast/ast-traversal-visitor.h
diff --git a/src/ast/ast-traversal-visitor.h b/src/ast/ast-traversal-visitor.h
index 0f2976c4ca4f9e6b9b290ad761620c4881609b74..c8284b771e7b8de9df0b7c52652524c54974b97d 100644
--- a/src/ast/ast-traversal-visitor.h
+++ b/src/ast/ast-traversal-visitor.h
@@ -286,7 +286,7 @@
 void AstTraversalVisitor<Subclass>::VisitFunctionLiteral(
     FunctionLiteral* expr) {
   PROCESS_EXPRESSION(expr);
-  DeclarationScope* scope = expr->scope();
+  Scope* scope = expr->scope();
   RECURSE_EXPRESSION(VisitDeclarations(scope->declarations()));
   RECURSE_EXPRESSION(VisitStatements(expr->body()));
 }