Fix a couple of references in _runtime that should have been resolved as quasiquotes

tool/input_sdk/private/types.dart

Index: tool/input_sdk/private/types.dart
diff --git a/tool/input_sdk/private/types.dart b/tool/input_sdk/private/types.dart
index d0029361a8930d223506b1c289f74df5dfe01b03..ec99cf99bfe4e073de115f42bc5ff49302f4270f 100644
--- a/tool/input_sdk/private/types.dart
+++ b/tool/input_sdk/private/types.dart
@@ -263,7 +263,7 @@ _functionType(definite, returnType, args, extra) => JS('', '''(() => {
 /// they will be replaced with bottom.
 ///
 functionType(returnType, args, extra) => JS('', '''(() => {
-  return _functionType(false, $returnType, $args, $extra);
+  return $_functionType(false, $returnType, $args, $extra);
 })()''');
 
 ///
@@ -271,7 +271,7 @@ functionType(returnType, args, extra) => JS('', '''(() => {
 /// bottom occurs.
 ///
 definiteFunctionType(returnType, args, extra) => JS('', '''(() => {
-  return _functionType(true, $returnType, $args, $extra);
+  return $_functionType(true, $returnType, $args, $extra);
 })()''');
 
 typedef(name, closure) => JS('', '''(() => {