Make WheelEvent.delta{X,Y} return num, not int.

lib/html/dartium/html_dartium.dart

Index: lib/html/dartium/html_dartium.dart
diff --git a/lib/html/dartium/html_dartium.dart b/lib/html/dartium/html_dartium.dart
index 973b4bbb8f4609119997f0c8f190900d231142a8..9bc79f3812ec5d3ab9731ca3cd5c029256d5445f 100644
--- a/lib/html/dartium/html_dartium.dart
+++ b/lib/html/dartium/html_dartium.dart
@@ -41115,18 +41115,18 @@ abstract class WheelEvent implements MouseEvent {
   /** @domName WheelEvent.webkitDirectionInvertedFromDevice */
   abstract bool get webkitDirectionInvertedFromDevice;
 
-  /** @domName WheelEvent.deltaX */
-  abstract int get deltaX;
-
-  /** @domName WheelEvent.deltaY */
-  abstract int get deltaY;
-
   /** @domName WheelEvent.initWebKitWheelEvent */
   void initWebKitWheelEvent(int wheelDeltaX, int wheelDeltaY, LocalWindow view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey);
 
 
+  /** @domName WheelEvent.deltaX */
+  abstract num get deltaX;
+
+  /** @domName WheelEvent.deltaY */
+  abstract num get deltaY;
+
   /** @domName WheelEvent.deltaMode */
-  int get deltaMode;
+  abstract int get deltaMode;
 }
 // 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
@@ -41136,13 +41136,15 @@ class _WheelEventImpl extends _MouseEventImpl implements WheelEvent {
 
   bool get webkitDirectionInvertedFromDevice native "WheelEvent_webkitDirectionInvertedFromDevice_Getter";
 
-  int get deltaX native "WheelEvent_wheelDeltaX_Getter";
+  int get _wheelDeltaX native "WheelEvent_wheelDeltaX_Getter";
 
-  int get deltaY native "WheelEvent_wheelDeltaY_Getter";
+  int get _wheelDeltaY native "WheelEvent_wheelDeltaY_Getter";
 
   void initWebKitWheelEvent(int wheelDeltaX, int wheelDeltaY, LocalWindow view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey) native "WheelEvent_initWebKitWheelEvent_Callback";
 
 
+  num get deltaX => _wheelDeltaX;
+  num get deltaY => _wheelDeltaY;
   int get deltaMode => 0;
 
 }