Rename WebKit's WheelEvent.wheelDelta{X,Y} to W3C WheelEvent.delta{X,Y}.

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 263ca736e75feead91bf7d8fef4545e19c793138..a2dd5335fbdfb2e599a32c0eeb35e746c5820f26 100644
--- a/lib/html/dartium/html_dartium.dart
+++ b/lib/html/dartium/html_dartium.dart
@@ -41115,15 +41115,15 @@ abstract class WheelEvent implements MouseEvent {
   /** @domName WheelEvent.webkitDirectionInvertedFromDevice */
   abstract bool get webkitDirectionInvertedFromDevice;
 
-  /** @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 */
-  num get deltaX;
+  abstract int get deltaX;
 
   /** @domName WheelEvent.deltaY */
-  num get 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.deltaMode */
   int get deltaMode;
@@ -41136,11 +41136,13 @@ class _WheelEventImpl extends _MouseEventImpl implements WheelEvent {
 
   bool get webkitDirectionInvertedFromDevice native "WheelEvent_webkitDirectionInvertedFromDevice_Getter";
 
+  int get deltaX native "WheelEvent_wheelDeltaX_Getter";
+
+  int get deltaY 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 deltaY native 'WheelEvent_wheelDelta_Getter';
-  num get deltaX native 'WheelEvent_wheelDeltaX_Getter';
   int get deltaMode => 0;
 
 }