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

Source/core/timing/Performance.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 263 matching lines @@
 {
     return 1000.0 * (monotonicallyIncreasingTime() - m_referenceTime);
 }
 
 void Performance::trace(Visitor* visitor)
 {
     visitor->trace(m_navigation);
     visitor->trace(m_timing);
     visitor->trace(m_resourceTimingBuffer);
     visitor->trace(m_userTiming);
+    EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore