Fix for opening SDK sources.

pkg/analyzer/lib/src/generated/sdk.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.sdk;
 
 import 'dart:collection';
 import 'source.dart' show ContentCache, Source, UriKind;
 import 'ast.dart';
 import 'engine.dart' show AnalysisContext;
 
+
 /**
  * Instances of the class `DartSdk` represent a Dart SDK installed in a specified location.
  */
 abstract class DartSdk {
   /**
    * The short name of the dart SDK async library.
    */
   static final String DART_ASYNC = "dart:async";
 
   /**
@@ skipping 412 matching lines @@
     this._implementation = implementation;
   }
 
   /**
    * Record that this library can be run on the VM.
    */
   void setVmLibrary() {
     _platforms |= VM_PLATFORM;
   }
 }