Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXLayoutObject.cpp

Index: Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/Source/modules/accessibility/AXLayoutObject.cpp b/Source/modules/accessibility/AXLayoutObject.cpp
index 1d0564acb34df125560efc3e34a5c7654acad84e..701a7171e44be2ee22e5451122f5f0799ce7f3d7 100644
--- a/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/Source/modules/accessibility/AXLayoutObject.cpp
@@ -181,9 +181,9 @@ AXLayoutObject::AXLayoutObject(LayoutObject* layoutObject, AXObjectCacheImpl& ax
 #endif
 }
 
-PassRefPtr<AXLayoutObject> AXLayoutObject::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
+PassRefPtrWillBeRawPtr<AXLayoutObject> AXLayoutObject::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
-    return adoptRef(new AXLayoutObject(layoutObject, axObjectCache));
+    return adoptRefWillBeNoop(new AXLayoutObject(layoutObject, axObjectCache));
 }
 
 AXLayoutObject::~AXLayoutObject()
@@ -1707,7 +1707,7 @@ void AXLayoutObject::addChildren()
     Vector<AXObject*> ownedChildren;
     computeAriaOwnsChildren(ownedChildren);
 
-    for (RefPtr<AXObject> obj = firstChild(); obj; obj = obj->nextSibling()) {
+    for (RefPtrWillBeRawPtr<AXObject> obj = firstChild(); obj; obj = obj->nextSibling()) {
         if (!axObjectCache().isAriaOwned(obj.get()))
             addChild(obj.get());
     }