Oilpan: Prepare to move AXObjectCache to the heap

Source/modules/accessibility/InspectorAccessibilityAgent.cpp

Index: Source/modules/accessibility/InspectorAccessibilityAgent.cpp
diff --git a/Source/modules/accessibility/InspectorAccessibilityAgent.cpp b/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
index 68b5a477dc35880fc69d6c55d048af8ce316f406..f43c4ce29e01b7d40e49437714ffe52cf3f18c03 100644
--- a/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
+++ b/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
@@ -356,11 +356,12 @@ void InspectorAccessibilityAgent::getAXNode(ErrorString* errorString, int nodeId
         return;
 
     Document& document = node->document();
-    OwnPtr<ScopedAXObjectCache> cache = ScopedAXObjectCache::create(document);
+    OwnPtrWillBeRawPtr<ScopedAXObjectCache> cache = ScopedAXObjectCache::create(document);
     AXObjectCacheImpl* cacheImpl = toAXObjectCacheImpl(cache->get());
     AXObject* axObject = cacheImpl->getOrCreate(node);
     if (!axObject || axObject->accessibilityIsIgnored()) {
         accessibilityNode = buildObjectForIgnoredNode(node, axObject, cacheImpl);
+        cache->dispose();
         return;
     }
 
@@ -372,6 +373,7 @@ void InspectorAccessibilityAgent::getAXNode(ErrorString* errorString, int nodeId
     fillRelationships(axObject, properties);
 
     accessibilityNode = buildObjectForNode(node, axObject, cacheImpl, properties);
+    cache->dispose();
 }
 
 DEFINE_TRACE(InspectorAccessibilityAgent)