Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/DirectoryReader.h

Index: Source/modules/filesystem/DirectoryReader.h
diff --git a/Source/modules/filesystem/DirectoryReader.h b/Source/modules/filesystem/DirectoryReader.h
index 7ec604d2718eb849c391053269e24348f9c07562..965896bb2637e7e096ed6460ad30c6350b61a25d 100644
--- a/Source/modules/filesystem/DirectoryReader.h
+++ b/Source/modules/filesystem/DirectoryReader.h
@@ -32,6 +32,7 @@
 #define DirectoryReader_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "heap/Handle.h"
 #include "modules/filesystem/DOMFileSystem.h"
 #include "modules/filesystem/DirectoryReaderBase.h"
 #include "wtf/PassRefPtr.h"
@@ -46,9 +47,9 @@ class ErrorCallback;
 
 class DirectoryReader : public DirectoryReaderBase, public ScriptWrappable {
 public:
-    static PassRefPtr<DirectoryReader> create(PassRefPtr<DOMFileSystemBase> fileSystem, const String& fullPath)
+    static PassRefPtrWillBeRawPtr<DirectoryReader> create(PassRefPtrWillBeRawPtr<DOMFileSystemBase> fileSystem, const String& fullPath)
     {
-        return adoptRef(new DirectoryReader(fileSystem, fullPath));
+        return adoptRefWillBeNoop(new DirectoryReader(fileSystem, fullPath));
     }
 
     void readEntries(PassOwnPtr<EntriesCallback>, PassOwnPtr<ErrorCallback> = nullptr);
@@ -56,7 +57,7 @@ public:
     DOMFileSystem* filesystem() const { return static_cast<DOMFileSystem*>(m_fileSystem.get()); }
 
 private:
-    DirectoryReader(PassRefPtr<DOMFileSystemBase>, const String& fullPath);
+    DirectoryReader(PassRefPtrWillBeRawPtr<DOMFileSystemBase>, const String& fullPath);
 };
 
 }