[oilpan] Move EventHandler to the heap

Source/core/page/AutoscrollController.cpp

Index: Source/core/page/AutoscrollController.cpp
diff --git a/Source/core/page/AutoscrollController.cpp b/Source/core/page/AutoscrollController.cpp
index 5ac95667f453697da2b60370c7d29b8c8ce85b24..d0d955b37c67bbf7fe52db72a82b4a9c686af14c 100644
--- a/Source/core/page/AutoscrollController.cpp
+++ b/Source/core/page/AutoscrollController.cpp
@@ -103,7 +103,7 @@ void AutoscrollController::stopAutoscrollTimer(bool rendererIsBeingDestroyed)
     if (!scrollable)
         return;
 
-    EventHandler* eventHandler = m_frame->eventHandler();
+    HANDLE(EventHandler) eventHandler = m_frame->eventHandler();
     if (autoscrollInProgress() && eventHandler->mouseDownWasInSubframe()) {
         if (Frame* subframe = eventHandler->subframeForTargetNode(eventHandler->mousePressNode()))
             subframe->eventHandler()->stopAutoscrollTimer(rendererIsBeingDestroyed);
@@ -258,7 +258,7 @@ void AutoscrollController::autoscrollTimerFired(Timer<AutoscrollController>*)
             m_autoscrollRenderer->autoscroll(m_dragAndDropAutoscrollReferencePosition);
         break;
     case AutoscrollForSelection: {
-        EventHandler* eventHandler = m_frame->eventHandler();
+        HANDLE(EventHandler) eventHandler = m_frame->eventHandler();
         if (!eventHandler->mousePressed()) {
             stopAutoscrollTimer();
             return;