patch_sdk: fix part/import order

test/generated_sdk/lib/isolate/isolate.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.
 
 /**
  * Concurrent programming using _isolates_:
  * independent workers that are similar to threads
  * but don't share memory,
  * communicating only via messages.
  */
 library dart.isolate;
 
 import "dart:async";
-
-part "capability.dart";
 import 'dart:_js_helper' show patch;
 import 'dart:_isolate_helper' show CapabilityImpl,
                                    CloseToken,
                                    IsolateNatives,
                                    JsIsolateSink,
                                    ReceivePortImpl,
                                    RawReceivePortImpl;
 
+part "capability.dart";
+
 /**
  * Thrown when an isolate cannot be created.
  */
 class IsolateSpawnException implements Exception {
   /** Error message reported by the spawn operation. */
   final String message;
   IsolateSpawnException(this.message);
   String toString() => "IsolateSpawnException: $message";
 }
 
@@ skipping 660 matching lines @@
       : _description = description,
         stackTrace = new _RemoteStackTrace(stackDescription);
   String toString() => _description;
 }
 
 class _RemoteStackTrace implements StackTrace {
   String _trace;
   _RemoteStackTrace(this._trace);
   String toString() => _trace;
 }