Make isEmpty a getter.

runtime/bin/common.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.
 
 // Constants used when working with native ports.
 const int _SUCCESS_RESPONSE = 0;
 const int _ILLEGAL_ARGUMENT_RESPONSE = 1;
 const int _OSERROR_RESPONSE = 2;
 const int _FILE_CLOSED_RESPONSE = 3;
 
 const int _ERROR_RESPONSE_ERROR_TYPE = 0;
 const int _OSERROR_RESPONSE_ERROR_CODE = 1;
 const int _OSERROR_RESPONSE_MESSAGE = 2;
 
 /**
   * An [OSError] object holds information about an error from the
   * operating system.
   */
 class OSError {
   /** Constant used to indicate that no OS error code is available. */
   static const int noErrorCode = -1;
 
   /** Creates an OSError object from a message and an errorCode. */
   const OSError([String this.message = "", int this.errorCode = noErrorCode]);
 
   /** Converts an OSError object to a string representation. */
   String toString() {
     StringBuffer sb = new StringBuffer();
     sb.add("OS Error");
-    if (!message.isEmpty()) {
+    if (!message.isEmpty) {
       sb.add(": ");
       sb.add(message);
       if (errorCode != noErrorCode) {
         sb.add(", errno = ");
         sb.add(errorCode.toString());
       }
     } else if (errorCode != noErrorCode) {
       sb.add(": errno = ");
       sb.add(errorCode.toString());
     }
@@ skipping 42 matching lines @@
   for (int i = 0; i < bytes; i++) {
     int value = buffer[j];
     if (value is! int) {
       throw new FileIOException("List element is not an integer at index $j");
     }
     newBuffer[i] = value;
     j++;
   }
   return new _BufferAndOffset(newBuffer, 0);
 }