Remove files that have already been ported or do not need to be ported.

client/html/src/WebSocketWrappingImplementation.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.
-
-// TODO(jacobr) add events.
-class WebSocketWrappingImplementation extends EventTargetWrappingImplementation implements WebSocket {
-  WebSocketWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
-
-  String get URL() { return _ptr.URL; }
-
-  String get binaryType() { return _ptr.binaryType; }
-
-  void set binaryType(String value) { _ptr.binaryType = value; }
-
-  int get bufferedAmount() { return _ptr.bufferedAmount; }
-
-  EventListener get onclose() { return LevelDom.wrapEventListener(_ptr.onclose); }
-
-  void set onclose(EventListener value) { _ptr.onclose = LevelDom.unwrap(value); }
-
-  EventListener get onerror() { return LevelDom.wrapEventListener(_ptr.onerror); }
-
-  void set onerror(EventListener value) { _ptr.onerror = LevelDom.unwrap(value); }
-
-  EventListener get onmessage() { return LevelDom.wrapEventListener(_ptr.onmessage); }
-
-  void set onmessage(EventListener value) { _ptr.onmessage = LevelDom.unwrap(value); }
-
-  EventListener get onopen() { return LevelDom.wrapEventListener(_ptr.onopen); }
-
-  void set onopen(EventListener value) { _ptr.onopen = LevelDom.unwrap(value); }
-
-  String get protocol() { return _ptr.protocol; }
-
-  int get readyState() { return _ptr.readyState; }
-
-  void close() {
-    _ptr.close();
-    return;
-  }
-
-  bool send(String data) {
-    return _ptr.send(data);
-  }
-
-  String get typeName() { return "WebSocket"; }
-}