Always enable Oilpan for EventSource.

Source/modules/mediasource/SourceBuffer.cpp

 /*
  * Copyright (C) 2013 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 644 matching lines @@
 
     // 2. Set the updating attribute to true.
     m_updating = true;
 
     // 3. Queue a task to fire a simple event named updatestart at this SourceBuffer object.
     scheduleEvent(EventTypeNames::updatestart);
 
     // 4. Asynchronously run the stream append loop algorithm with stream and maxSize.
 
     stream->neuter();
-    m_loader = adoptPtr(new FileReaderLoader(FileReaderLoader::ReadByClient, this));
+    m_loader = FileReaderLoader::create(FileReaderLoader::ReadByClient, this);
     m_stream = stream;
     m_appendStreamAsyncPartRunner.runAsync();
 }
 
 void SourceBuffer::appendStreamAsyncPart()
 {
     ASSERT(m_updating);
     ASSERT(m_loader);
     ASSERT(m_stream);
 
@@ skipping 87 matching lines @@
 {
     visitor->trace(m_source);
     visitor->trace(m_stream);
     visitor->trace(m_trackDefaults);
     visitor->trace(m_asyncEventQueue);
     RefCountedGarbageCollectedEventTargetWithInlineData<SourceBuffer>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink