Move dart:dom implementation classes to dart:html library.

lib/dom/templates/html/dartium/impl_EventTarget.darttemplate

Index: lib/dom/templates/html/dartium/impl_EventTarget.darttemplate
diff --git a/lib/dom/templates/html/dartium/impl_EventTarget.darttemplate b/lib/dom/templates/html/dartium/impl_EventTarget.darttemplate
index 18b73540d74f0d719c2ffc14627cebb2d557efb4..819fa6e38e74f8550cf33a08ad71784067f7e411 100644
--- a/lib/dom/templates/html/dartium/impl_EventTarget.darttemplate
+++ b/lib/dom/templates/html/dartium/impl_EventTarget.darttemplate
@@ -3,17 +3,17 @@
 // BSD-style license that can be found in the LICENSE file.
 
 class _EventsImpl implements Events {
-
-  final _EventTargetImpl _ptr;
+  // TODO(podivilov): add type.
+  final _ptr;
 
   final Map<String, EventListenerList> _listenerMap;
 
   _EventsImpl(this._ptr) : _listenerMap = <EventListenerList>{};
 
   EventListenerList operator [](String type) {
-    return _get(type.toLowerCase());
+    return _get(type);
   }
-  
+
   EventListenerList _get(String type) {
     return _listenerMap.putIfAbsent(type,
       () => new _EventListenerListImpl(_ptr, type));
@@ -28,7 +28,8 @@ class _EventListenerWrapper {
 }
 
 class _EventListenerListImpl implements EventListenerList {
-  final _EventTargetImpl _ptr;
+  // TODO(podivilov): add type.
+  final _ptr;
   final String _type;
   List<_EventListenerWrapper> _wrappers;
 
@@ -50,11 +51,11 @@ class _EventListenerListImpl implements EventListenerList {
     // 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.$dom_dispatchEvent(evt);
+    return _ptr.dispatchEvent(_unwrap(evt));
   }
 
   void _add(EventListener listener, bool useCapture) {
-    _ptr.$dom_addEventListener(_type,
+    _ptr.addEventListener(_type,
                           _findOrAddWrapper(listener, useCapture),
                           useCapture);
   }
@@ -62,7 +63,7 @@ class _EventListenerListImpl implements EventListenerList {
   void _remove(EventListener listener, bool useCapture) {
     Function wrapper = _removeWrapper(listener, useCapture);
     if (wrapper !== null) {
-      _ptr.$dom_removeEventListener(_type, wrapper, useCapture);
+      _ptr.removeEventListener(_type, wrapper, useCapture);
     }
   }