Revert of Remove WheelEvent.initWebKitWheelEvent()

Source/core/events/WheelEvent.idl

Index: Source/core/events/WheelEvent.idl
diff --git a/Source/core/events/WheelEvent.idl b/Source/core/events/WheelEvent.idl
index 99686815b26df04eb1586fe5aad8cf2430576a47..aece23f4ca74c9d2928362534913427147f84f50 100644
--- a/Source/core/events/WheelEvent.idl
+++ b/Source/core/events/WheelEvent.idl
@@ -41,4 +41,17 @@
     // WebKit Extension
     [MeasureAs=PrefixedWheelEventDirectionInvertedFromDevice]
     readonly attribute boolean webkitDirectionInvertedFromDevice;
+
+    [MeasureAs=PrefixedWheelEventInit]
+    void initWebKitWheelEvent([Default=Undefined] optional long wheelDeltaX,
+                              [Default=Undefined] optional long wheelDeltaY,
+                              [Default=Undefined] optional Window view,
+                              [Default=Undefined] optional long screenX,
+                              [Default=Undefined] optional long screenY,
+                              [Default=Undefined] optional long clientX,
+                              [Default=Undefined] optional long clientY,
+                              [Default=Undefined] optional boolean ctrlKey,
+                              [Default=Undefined] optional boolean altKey,
+                              [Default=Undefined] optional boolean shiftKey,
+                              [Default=Undefined] optional boolean metaKey);
 };