Remove obsolete isolate bind method

runtime/lib/isolate.dart

 // Copyright (c) 2011, 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.
 
 class ReceivePortFactory {
   factory ReceivePort() {
     return new ReceivePortImpl();
   }
 
   factory ReceivePort.singleShot() {
@@ skipping 130 matching lines @@
     result.complete(port);
     return result;
   }
 
   // Starts a new isolate calling the run method on a new instance of the
   // remote class's type.
   // Returns the send port which is passed to the newly created isolate.
   // This method is being dispatched to from the public core library code.
   static SendPort _start(Isolate isolate, bool light)
       native "IsolateNatives_start";
-
-  // The VM knows in which isolate the function must be run, therefore
-  // there is no need for wrapping it.
-  static Function bind(Function f) { return f; }
 }