Oilpan: Prepare to move AXObjectCache to the heap

Source/core/dom/AXObjectCache.cpp

Index: Source/core/dom/AXObjectCache.cpp
diff --git a/Source/core/dom/AXObjectCache.cpp b/Source/core/dom/AXObjectCache.cpp
index b31a5b3b637ec20c202043e083c688a639536941..91a019e9a43dfeacd18f98785d4a51d99f7e71f3 100644
--- a/Source/core/dom/AXObjectCache.cpp
+++ b/Source/core/dom/AXObjectCache.cpp
@@ -40,7 +40,7 @@ void AXObjectCache::init(AXObjectCacheCreateFunction function)
     m_createFunction = function;
 }
 
-PassOwnPtr<AXObjectCache> AXObjectCache::create(Document& document)
+PassOwnPtrWillBeRawPtr<AXObjectCache> AXObjectCache::create(Document& document)
 {
     ASSERT(m_createFunction);
     return (m_createFunction)(document);
@@ -70,6 +70,12 @@ ScopedAXObjectCache::ScopedAXObjectCache(Document& document)
     }
 }
 
+ScopedAXObjectCache::~ScopedAXObjectCache()
+{
+    if (m_ownedCache)
+        m_ownedCache->dispose();
+}
+
 AXObjectCache* ScopedAXObjectCache::get()
 {
     ASSERT(m_cache);