Revert all html warning changes.

tools/dom/src/WrappedEvent.dart

Index: tools/dom/src/WrappedEvent.dart
diff --git a/tools/dom/src/WrappedEvent.dart b/tools/dom/src/WrappedEvent.dart
index 4f30af92cc2acd23a2ba45ffab5a236bbca4e319..af64faed5b8f6bd1563b04807704761cd4c92d9c 100644
--- a/tools/dom/src/WrappedEvent.dart
+++ b/tools/dom/src/WrappedEvent.dart
@@ -9,10 +9,6 @@ part of dart.html;
  */
 class _WrappedEvent implements Event {
   final Event wrapped;
-
-  /** The CSS selector involved with event delegation. */
-  String _selector;
-
   _WrappedEvent(this.wrapped);
 
   bool get bubbles => wrapped.bubbles;
@@ -50,41 +46,4 @@ class _WrappedEvent implements Event {
   void stopPropagation() {
     wrapped.stopPropagation();
   }
-
-  /**
-   * A pointer to the element whose CSS selector matched within which an event
-   * was fired. If this Event was not associated with any Event delegation,
-   * accessing this value will throw an [UnsupportedError].
-   */
-  Element get matchingTarget {
-    if (_selector == null) {
-      throw new UnsupportedError('Cannot call matchingTarget if this Event did'
-          ' not arise as a result of event delegation.');
-    }
-    var currentTarget = this.currentTarget;
-    var target = this.target;
-    var matchedTarget;
-    do {
-      if (target.matches(_selector)) return target;
-      target = target.parent;
-    } while (target != null && target != currentTarget.parent);
-    throw new StateError('No selector matched for populating matchedTarget.');
-  }
-
-  /**
-   * This event's path, taking into account shadow DOM.
-   *
-   * ## Other resources
-   *
-   * * [Shadow DOM extensions to Event]
-   * (http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-event) from
-   * W3C.
-   */
-  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#extensions-to-event
-  @Experimental()
-  List<Node> get path => wrapped.path;
-
-  dynamic get _get_currentTarget => wrapped._get_currentTarget;
-
-  dynamic get _get_target => wrapped._get_target;
 }