Enable Oilpan by default in modules/filesystem/

Source/modules/filesystem/SyncCallbackHelper.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 35 matching lines @@
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 template <typename ResultType, typename CallbackArg>
 struct HelperResultType {
     DISALLOW_ALLOCATION();
 public:
-    typedef PassRefPtrWillBeRawPtr<ResultType> ReturnType;
-    typedef RefPtrWillBePersistent<ResultType> StorageType;
+    typedef ResultType* ReturnType;
+    typedef Persistent<ResultType> StorageType;
 
     static ReturnType createFromCallbackArg(CallbackArg argument)
     {
         return ResultType::create(argument);
     }
 };
 
 // A helper template for FileSystemSync implementation.
 template <typename SuccessCallback, typename CallbackArg, typename ResultType>
 class SyncCallbackHelper FINAL : public RefCounted<SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> > {
@@ skipping 82 matching lines @@
     {
         m_result = ResultTypeTrait::createFromCallbackArg(result);
         m_completed = true;
     }
 
     ResultStorageType m_result;
     FileError::ErrorCode m_errorCode;
     bool m_completed;
 };
 
-struct EmptyType : public RefCountedWillBeGarbageCollected<EmptyType> {
-    static PassRefPtrWillBeRawPtr<EmptyType> create(EmptyType*)
+struct EmptyType : public GarbageCollected<EmptyType> {
+    static EmptyType* create(EmptyType*)
     {
-        return nullptr;
+        return 0;
     }
 
     void trace(Visitor*) { }
 };
 
 typedef SyncCallbackHelper<EntryCallback, Entry*, EntrySync> EntrySyncCallbackHelper;
 typedef SyncCallbackHelper<MetadataCallback, Metadata*, Metadata> MetadataSyncCallbackHelper;
 typedef SyncCallbackHelper<VoidCallback, EmptyType*, EmptyType> VoidSyncCallbackHelper;
 typedef SyncCallbackHelper<FileSystemCallback, DOMFileSystem*, DOMFileSystemSync> FileSystemSyncCallbackHelper;
 
 } // namespace WebCore
 
 #endif // SyncCallbackHelper_h