Fix pub and dart2js browser tests.

sdk/lib/_internal/pub/lib/src/dart.dart

Index: sdk/lib/_internal/pub/lib/src/dart.dart
diff --git a/sdk/lib/_internal/pub/lib/src/dart.dart b/sdk/lib/_internal/pub/lib/src/dart.dart
index c912fab983dc626c2983f9454583279901009dc8..ce4d59d50873eae05f9839e2eeb583393b0ff59c 100644
--- a/sdk/lib/_internal/pub/lib/src/dart.dart
+++ b/sdk/lib/_internal/pub/lib/src/dart.dart
@@ -66,6 +66,6 @@ bool isEntrypoint(CompilationUnit dart) {
   // but it parts in another file that does.
   return dart.declarations.any((node) {
     return node is FunctionDeclaration && node.name.name == "main" &&
-        node.functionExpression.parameters.elements.isEmpty;
+        node.functionExpression.parameters.parameters.isEmpty;
   });
 }