Remove support for 'argument definitions test' from dart2js.

sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart

Index: sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
diff --git a/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart b/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
index 81d00bb7e23e519d66b3798b14d2fe64b2ac78a9..865c1986e34b60bedf9c80d5ca90b2c89d412a80 100644
--- a/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
+++ b/sdk/lib/_internal/compiler/implementation/types/inferrer_visitor.dart
@@ -418,9 +418,6 @@ abstract class InferrerVisitor extends ResolvedVisitor<TypeMask> {
       TypeMask receiverType = visit(node.receiver);
       DartType type = elements.getType(node.arguments.head);
       return narrowType(receiverType, type, compiler);
-    } else if (node.isParameterCheck) {
-      node.visitChildren(this);
-      return inferrer.boolType;
     } else if (node.argumentsNode is Prefix) {
       // Unary operator.
       return visitDynamicSend(node);