Update pub to new getter syntax.

utils/pub/sdk_source.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('sdk_source');
 
 #import('io.dart');
 #import('package.dart');
 #import('pubspec.dart');
 #import('source.dart');
 #import('version.dart');
 
 /**
  * A package source that uses libraries from the Dart SDK.
  *
  * This currently uses the "sdkdir" command-line argument to find the SDK.
  */
 class SdkSource extends Source {
   final String name = "sdk";
   final bool shouldCache = false;
 
   /**
    * The root directory of the Dart SDK.
    */
   final String _rootDir;
 
-  String get rootDir() {
+  String get rootDir {
     if (_rootDir != null) return _rootDir;
     throw "Pub can't find the Dart SDK. Please set the DART_SDK environment "
       "variable to the Dart SDK directory.";
   }
 
   SdkSource(this._rootDir);
 
   /**
    * An SDK package has no dependencies. Its version number is inferred from the
    * revision number of the SDK itself.
@@ skipping 20 matching lines @@
         sourcePath = join(rootDir, "lib", id.description);
         return exists(sourcePath).chain((found) {
           if (!found) return new Future<bool>.immediate(false);
           return createSymlink(sourcePath, destPath).transform((_) => true);
         });
       }
       return createSymlink(sourcePath, destPath).transform((_) => true);
     });
   }
 }