[oilpan] Move IDBDatabase, IDBDatabaseCallbacks, IDBDatabaseBackendInterface and other related clas…

Source/modules/indexeddb/IDBRequest.h

Index: Source/modules/indexeddb/IDBRequest.h
diff --git a/Source/modules/indexeddb/IDBRequest.h b/Source/modules/indexeddb/IDBRequest.h
index 854328e1ee787307cf515edebd9567ca508f2bda..63f2721a72aea5ad208dc12e6bc2572d4e216e41 100644
--- a/Source/modules/indexeddb/IDBRequest.h
+++ b/Source/modules/indexeddb/IDBRequest.h
@@ -52,14 +52,11 @@ typedef int ExceptionCode;
 class IDBRequest : public ScriptWrappable, public IDBCallbacks, public EventTarget, public ActiveDOMObject {
     DEFINE_SELF_HANDLE(IDBRequest)
 public:
-    static PassRefPtr<IDBRequest> create(ScriptExecutionContext*, PassRefPtr<IDBAny> source, IDBTransaction*);
-    static PassRefPtr<IDBRequest> create(ScriptExecutionContext*, PassRefPtr<IDBAny> source, IDBDatabaseBackendInterface::TaskType, IDBTransaction*);
+    static IDBRequest* create(ScriptExecutionContext*, PassRefPtr<IDBAny> source, IDBTransaction*);
+    static IDBRequest* create(ScriptExecutionContext*, PassRefPtr<IDBAny> source, IDBDatabaseBackendInterface::TaskType, IDBTransaction*);
     virtual ~IDBRequest();
 
-    virtual void trace(Visitor* visitor) OVERRIDE
-    {
-        IDBCallbacks::trace(visitor);
-    }
+    virtual void trace(Visitor* visitor) OVERRIDE;
 
     virtual void visitWith(Visitor* visitor) const OVERRIDE
     {