Fix out-of-memory crashes related to ArrayBuffer allocation

third_party/WebKit/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 353 matching lines @@
     // All possible events have fired and we're done, no more pending activity.
     ThrottlingController::finishReader(executionContext(), this, finalStep);
 }
 
 void FileReader::result(StringOrArrayBuffer& resultAttribute) const
 {
     if (!m_loader || m_error)
         return;
 
     if (m_readType == FileReaderLoader::ReadAsArrayBuffer)
-        resultAttribute.setArrayBuffer(m_loader->arrayBufferResult());
+        resultAttribute.setArrayBuffer(m_loader->arrayBufferResultOrNull());
     else
         resultAttribute.setString(m_loader->stringResult());
 }
 
 void FileReader::terminate()
 {
     if (m_loader) {
         m_loader->cancel();
         m_loader = nullptr;
     }
@@ skipping 84 matching lines @@
 }
 
 DEFINE_TRACE(FileReader)
 {
     visitor->trace(m_error);
     RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink