Remove support for 'argument definitions test' from dart2js.

sdk/lib/_internal/compiler/implementation/closure.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library closureToClassMapper;
 
 import "elements/elements.dart";
 import "dart2jslib.dart";
 import "dart_types.dart";
 import "scanner/scannerlib.dart" show Token;
@@ skipping 497 matching lines @@
                Elements.isInstanceSend(node, elements)) {
       registerNeedsThis();
     } else if (node.isSuperCall) {
       registerNeedsThis();
     } else if (node.isIsCheck || node.isIsNotCheck || node.isTypeCast) {
       TypeAnnotation annotation = node.typeAnnotationFromIsCheckOrCast;
       DartType type = elements.getType(annotation);
       if (type != null && type.containsTypeVariables) {
         registerNeedsThis();
       }
-    } else if (node.isParameterCheck) {
-      Element parameter = elements[node.receiver];
-      FunctionElement enclosing = parameter.enclosingElement;
-      FunctionExpression function = enclosing.parseNode(compiler);
-      ClosureClassMap cached = closureMappingCache[function];
-      if (!cached.parametersWithSentinel.containsKey(parameter)) {
-        SourceString parameterName = parameter.name;
-        String name = '${parameterName.slowToString()}_check';
-        Element newElement = new CheckVariableElement(new SourceString(name),
-                                                      parameter,
-                                                      enclosing);
-        useLocal(newElement);
-        cached.parametersWithSentinel[parameter] = newElement;
-      }
     } else if (node.isTypeTest) {
       DartType type = elements.getType(node.typeAnnotationFromIsCheckOrCast);
       analyzeType(type);
     } else if (node.isTypeCast) {
       DartType type = elements.getType(node.arguments.head);
       analyzeType(type);
     }
     node.visitChildren(this);
   }
 
@@ skipping 272 matching lines @@
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     bool oldInTryStatement = inTryStatement;
     inTryStatement = true;
     node.visitChildren(this);
     inTryStatement = oldInTryStatement;
   }
 }