Remove unused code and templates.

lib/dom/src/native_EventsImplementation.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.
-
-class EventsImplementation implements html.Events {
-
-  final EventTarget _ptr;
-
-  final Map<String, html.EventListenerList> _listenerMap;
-
-  EventsImplementation(this._ptr) : _listenerMap = <html.EventListenerList>{};
-
-  html.EventListenerList operator [](String type) {
-    return _listenerMap.putIfAbsent(type,
-      () => new EventListenerListImplementation(_ptr, type));
-  }
-}
-
-class EventListenerWrapper {
-  final html.EventListener raw;
-  final Function wrapped;
-  final bool useCapture;
-  EventListenerWrapper(this.raw, this.wrapped, this.useCapture);
-}
-
-class EventListenerListImplementation implements html.EventListenerList {
-  final EventTarget _ptr;
-  final String _type;
-  List<EventListenerWrapper> _wrappers;
-
-  EventListenerListImplementation(this._ptr, this._type)
-    : _wrappers = <EventListenerWrapper>[];
-
-  html.EventListenerList add(html.EventListener listener, [bool useCapture = false]) {
-    _add(listener, useCapture);
-    return this;
-  }
-
-  html.EventListenerList remove(html.EventListener listener, [bool useCapture = false]) {
-    _remove(listener, useCapture);
-    return this;
-  }
-
-  bool dispatch(html.Event evt) {
-    // TODO(jacobr): what is the correct behavior here. We could alternately
-    // force the event to have the expected type.
-    assert(evt.type == _type);
-    return _ptr.dispatchEvent(html.unwrap_internal(evt));
-  }
-
-  void _add(html.EventListener listener, bool useCapture) {
-    _ptr.addEventListener(_type,
-                          _findOrAddWrapper(listener, useCapture),
-                          useCapture);
-  }
-
-  void _remove(html.EventListener listener, bool useCapture) {
-    Function wrapper = _removeWrapper(listener, useCapture);
-    if (wrapper !== null) {
-      _ptr.removeEventListener(_type, wrapper, useCapture);
-    }
-  }
-
-  Function _removeWrapper(html.EventListener listener, bool useCapture) {
-    if (_wrappers === null) {
-      return null;
-    }
-    for (int i = 0; i < _wrappers.length; i++) {
-      EventListenerWrapper wrapper = _wrappers[i];
-      if (wrapper.raw === listener && wrapper.useCapture == useCapture) {
-        // Order doesn't matter so we swap with the last element instead of
-        // performing a more expensive remove from the middle of the list.
-        if (i + 1 != _wrappers.length) {
-          _wrappers[i] = _wrappers.removeLast();
-        } else {
-          _wrappers.removeLast();
-        }
-        return wrapper.wrapped;
-      }
-    }
-    return null;
-  }
-
-  Function _findOrAddWrapper(html.EventListener listener, bool useCapture) {
-    if (_wrappers === null) {
-      _wrappers = <EventListenerWrapper>[];
-    } else {
-      for (EventListenerWrapper wrapper in _wrappers) {
-        if (wrapper.raw === listener && wrapper.useCapture == useCapture) {
-          return wrapper.wrapped;
-        }
-      }
-    }
-    final wrapped = (e) { listener(html.wrap_internal(e)); };
-    _wrappers.add(new EventListenerWrapper(listener, wrapped, useCapture));
-    return wrapped;
-  }
-}