Enable Oilpan for core/clipboard/

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index e7801665ae533a6005eb58e5b9092470430378a2..99fb9a1b95f9fd010922b2056aa63c3ab60a3168 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -278,7 +278,7 @@ DEFINE_TRACE(EventHandler)
 
 DragState& EventHandler::dragState()
 {
-    DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<DragState>, state, (adoptPtrWillBeNoop(new DragState())));
+    DEFINE_STATIC_LOCAL(Persistent<DragState>, state, (new DragState()));
     return *state;
 }
 
@@ -4065,7 +4065,7 @@ bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent,
     return toFrameView(&widget)->frame().eventHandler().handleWheelEvent(wheelEvent);
 }
 
-PassRefPtrWillBeRawPtr<DataTransfer> EventHandler::createDraggingDataTransfer() const
+DataTransfer* EventHandler::createDraggingDataTransfer() const
 {
     return DataTransfer::create(DataTransfer::DragAndDrop, DataTransferWritable, DataObject::create());
 }