Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/ScriptedAnimationController.cpp

Index: Source/core/dom/ScriptedAnimationController.cpp
diff --git a/Source/core/dom/ScriptedAnimationController.cpp b/Source/core/dom/ScriptedAnimationController.cpp
index 27a7f6b463f173ab8259b7a6e08c639cfad47de5..29ed5b83c475fe8ec1f88f8939cbd85cd839781d 100644
--- a/Source/core/dom/ScriptedAnimationController.cpp
+++ b/Source/core/dom/ScriptedAnimationController.cpp
@@ -110,7 +110,7 @@ void ScriptedAnimationController::dispatchEvents()
         // special casting window.
         // FIXME: We should not fire events for nodes that are no longer in the tree.
         if (DOMWindow* window = eventTarget->toDOMWindow())
-            window->dispatchEvent(events[i], 0);
+            window->dispatchEvent(events[i], nullptr);
         else
             eventTarget->dispatchEvent(events[i]);
     }