Updating IDL for WebSocket to cover latest IDL updates.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
 import 'dart:svg' as svg;
@@ skipping 21079 matching lines @@
 
   /// @domName WebSocket.dispatchEvent; @docsEditable true
   @JSName('dispatchEvent')
   bool $dom_dispatchEvent(Event evt) native;
 
   /// @domName WebSocket.removeEventListener; @docsEditable true
   @JSName('removeEventListener')
   void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]) native;
 
   /// @domName WebSocket.send; @docsEditable true
-  bool send(data) native;
+  void send(data) native;
 }
 
 /// @docsEditable true
 class WebSocketEvents extends Events {
   /// @docsEditable true
   WebSocketEvents(EventTarget _ptr) : super(_ptr);
 
   /// @docsEditable true
   EventListenerList get close => this['close'];
 
@@ skipping 5787 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }