Always enable Oilpan for EventSource.

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 301 matching lines @@
     m_error = nullptr;
     ASSERT(ThrottlingController::from(context));
     ThrottlingController::pushReader(context, this);
 }
 
 void FileReader::executePendingRead()
 {
     ASSERT(m_loadingState == LoadingStatePending);
     m_loadingState = LoadingStateLoading;
 
-    m_loader = adoptPtr(new FileReaderLoader(m_readType, this));
+    m_loader = FileReaderLoader::create(m_readType, this);
     m_loader->setEncoding(m_encoding);
     m_loader->setDataType(m_blobType);
     m_loader->start(executionContext(), m_blobDataHandle);
     m_blobDataHandle = nullptr;
 }
 
 static void delayedAbort(FileReader* reader)
 {
     reader->doAbort();
 }
@@ skipping 136 matching lines @@
 }
 
 DEFINE_TRACE(FileReader)
 {
     visitor->trace(m_error);
     RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink