Add support for DOM Level 3 WheelEvent

Source/core/dom/EventTarget.cpp

Index: Source/core/dom/EventTarget.cpp
diff --git a/Source/core/dom/EventTarget.cpp b/Source/core/dom/EventTarget.cpp
index db4032152b38c8c78206f0b42599858ce018126c..e04248afc8f0cc2c5b195e6f53bcfd2367fe875b 100644
--- a/Source/core/dom/EventTarget.cpp
+++ b/Source/core/dom/EventTarget.cpp
@@ -176,11 +176,14 @@ void EventTarget::uncaughtExceptionInEventHandler()
 {
 }
 
-static AtomicString prefixedType(const Event* event)
+static AtomicString legacyType(const Event* event)
 {
     if (event->type() == eventNames().transitionendEvent)
         return eventNames().webkitTransitionEndEvent;
 
+    if (event->type() == eventNames().wheelEvent)
+        return eventNames().mousewheelEvent;
+
     return emptyString();
 }
 
@@ -194,7 +197,7 @@ bool EventTarget::fireEventListeners(Event* event)
         return true;
 
     EventListenerVector* listenerPrefixedVector = 0;
-    AtomicString prefixedTypeName = prefixedType(event);
+    AtomicString prefixedTypeName = legacyType(event);
     if (!prefixedTypeName.isEmpty())
         listenerPrefixedVector = d->eventListenerMap.find(prefixedTypeName);
 
@@ -209,7 +212,7 @@ bool EventTarget::fireEventListeners(Event* event)
         event->setType(unprefixedTypeName);
     }
 
-    if (!prefixedTypeName.isEmpty()) {
+    if (prefixedTypeName == eventNames().webkitTransitionEndEvent) {
         if (DOMWindow* executingWindow = this->executingWindow()) {
             if (listenerPrefixedVector) {
                 if (listenerUnprefixedVector)