Revert all html warning changes.

tools/dom/src/dart2js_KeyEvent.dart

Index: tools/dom/src/dart2js_KeyEvent.dart
diff --git a/tools/dom/src/dart2js_KeyEvent.dart b/tools/dom/src/dart2js_KeyEvent.dart
index f3be576c6e5379c72a87ae44f5ff9b28a4117209..8c7b5fd6d6741f823f565be956fb393f1610d428 100644
--- a/tools/dom/src/dart2js_KeyEvent.dart
+++ b/tools/dom/src/dart2js_KeyEvent.dart
@@ -210,15 +210,4 @@ class KeyEvent extends _WrappedEvent implements KeyboardEvent {
     throw new UnsupportedError(
         "Cannot initialize a KeyboardEvent from a KeyEvent.");
   }
-  int get _layerX => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _layerY => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _pageX => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _pageY => throw new UnsupportedError('Not applicable to KeyEvent');
-  @Experimental() // untriaged
-  bool getModifierState(String keyArgument) => throw new UnimplementedError();
-  @Experimental() // untriaged
-  int get location => throw new UnimplementedError();
-  @Experimental() // untriaged
-  bool get repeat => throw new UnimplementedError();
-  dynamic get _get_view => throw new UnimplementedError();
 }