Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/FileEntrySync.h

Index: Source/modules/filesystem/FileEntrySync.h
diff --git a/Source/modules/filesystem/FileEntrySync.h b/Source/modules/filesystem/FileEntrySync.h
index 7874f7ebdb01cee7872fb6f4b7cc56e62f0d47e5..aa58a2830345c55964b99e122fcc57c5e55002ee 100644
--- a/Source/modules/filesystem/FileEntrySync.h
+++ b/Source/modules/filesystem/FileEntrySync.h
@@ -45,18 +45,20 @@ class FileWriterSync;
 
 class FileEntrySync FINAL : public EntrySync {
 public:
-    static PassRefPtr<FileEntrySync> create(PassRefPtr<DOMFileSystemBase> fileSystem, const String& fullPath)
+    static PassRefPtrWillBeRawPtr<FileEntrySync> create(PassRefPtrWillBeRawPtr<DOMFileSystemBase> fileSystem, const String& fullPath)
     {
-        return adoptRef(new FileEntrySync(fileSystem, fullPath));
+        return adoptRefWillBeNoop(new FileEntrySync(fileSystem, fullPath));
     }
 
     virtual bool isFile() const OVERRIDE { return true; }
 
     PassRefPtrWillBeRawPtr<File> file(ExceptionState&);
-    PassRefPtr<FileWriterSync> createWriter(ExceptionState&);
+    PassRefPtrWillBeRawPtr<FileWriterSync> createWriter(ExceptionState&);
+
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
-    FileEntrySync(PassRefPtr<DOMFileSystemBase>, const String& fullPath);
+    FileEntrySync(PassRefPtrWillBeRawPtr<DOMFileSystemBase>, const String& fullPath);
 };
 
 DEFINE_TYPE_CASTS(FileEntrySync, EntrySync, entry, entry->isFile(), entry.isFile());