Get rid of a lot of () for getters.

lib/core/exceptions.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.
 
 // Exceptions are thrown either by the VM or from Dart code.
 
 /**
  * Interface implemented by all core library exceptions.
  */
 interface Exception default ExceptionImplementation {
@@ skipping 129 matching lines @@
   String toString() {
     if (functionName == null) {
       return exceptionName;
     } else {
       return "$exceptionName : method: '$functionName'\n"
           "Receiver: null\n"
           "Arguments: $arguments";
     }
   }
 
-  String get exceptionName() => "NullPointerException";
+  String get exceptionName => "NullPointerException";
 
   final String functionName;
   final List arguments;
 }
 
 
 class NoMoreElementsException implements Exception {
   const NoMoreElementsException();
   String toString() => "NoMoreElementsException";
 }
@@ skipping 35 matching lines @@
 }
 
 /**
  * Exception thrown when a runtime error occurs.
  */
 class RuntimeError implements Exception {
   final message;
   RuntimeError(this.message);
   String toString() => "RuntimeError: $message";
 }