Oilpan: add transition types to FileSystem APIs.

Source/bindings/v8/SerializedScriptValue.cpp

Index: Source/bindings/v8/SerializedScriptValue.cpp
diff --git a/Source/bindings/v8/SerializedScriptValue.cpp b/Source/bindings/v8/SerializedScriptValue.cpp
index 267762e420e7c9f851a20c144286759610a013b4..802c2e9fe14c2c3f2cb9a4be9db1a84984650153 100644
--- a/Source/bindings/v8/SerializedScriptValue.cpp
+++ b/Source/bindings/v8/SerializedScriptValue.cpp
@@ -1871,7 +1871,7 @@ private:
             return false;
         if (!readWebCoreString(&url))
             return false;
-        RefPtr<DOMFileSystem> fs = DOMFileSystem::create(currentExecutionContext(m_isolate), name, static_cast<WebCore::FileSystemType>(type), KURL(ParsedURLString, url));
+        RefPtrWillBeRawPtr<DOMFileSystem> fs = DOMFileSystem::create(currentExecutionContext(m_isolate), name, static_cast<WebCore::FileSystemType>(type), KURL(ParsedURLString, url));
         *value = toV8(fs.release(), v8::Handle<v8::Object>(), m_isolate);
         return true;
     }