Make isEmpty a getter.

lib/compiler/implementation/runtime_types.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 runtime_types;
 
 import 'dart2jslib.dart';
 import 'elements/elements.dart';
 import 'tree/tree.dart';
 import 'universe/universe.dart';
@@ skipping 15 matching lines @@
       name = '$guess@$id';
       id++;
     }
     usedNames[name] = element;
     return name;
   }
 
   bool hasTypeArguments(DartType type) {
     if (type is InterfaceType) {
       InterfaceType interfaceType = type;
-      return !interfaceType.arguments.isEmpty();
+      return !interfaceType.arguments.isEmpty;
     }
     return false;
   }
 
   /**
    * Map type variables to strings calling [:stringify:] and joins the results
    * to a single string separated by commas.
    * The argument [:hasValue:] is used to treat variables that will not receive
    * a value at the use site of the code that is generated with this function.
    */
@@ skipping 15 matching lines @@
   }
 
   /**
    * Generate a string representation template for this element, using '#' to
    * denote the place for the type argument input. If there are more type
    * variables than [numberOfInputs], 'Dynamic' is used as the value for these
    * arguments.
    */
   String generateRuntimeTypeString(ClassElement element, int numberOfInputs) {
     String elementName = getName(element);
-    if (element.typeVariables.isEmpty()) return "'$elementName'";
+    if (element.typeVariables.isEmpty) return "'$elementName'";
     String stringify(_, bool hasValue) => hasValue ? "' + # + '" : "Dynamic";
     String arguments = stringifyTypeVariables(element.typeVariables,
                                               numberOfInputs,
                                               stringify);
     return "'$elementName<$arguments>'";
   }
 
   /**
    * Generate a string template for the runtime type fields that contain the
    * type descriptions of the reified type arguments, using '#' to denote the
    * place for the type argument value, or [:null:] if there are more than
    * [numberOfInputs] type variables.
    */
   static String generateTypeVariableString(ClassElement element,
                                            int numberOfInputs) {
     String stringify(TypeVariableType variable, bool hasValue) {
       return "'${variable.name.slowToString()}': #";
     }
     return stringifyTypeVariables(element.typeVariables, numberOfInputs,
                                   stringify);
   }
 }