Oilpan: Allocate all EventTarget derived types on the manged heap.

Source/core/fileapi/FileReader.cpp

 /*
  * Copyright (C) 2010 Google Inc.  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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 389 matching lines @@
 String FileReader::stringResult()
 {
     if (!m_loader || m_error)
         return String();
     return m_loader->stringResult();
 }
 
 void FileReader::trace(Visitor* visitor)
 {
     visitor->trace(m_error);
+    EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore