FileReader.result attribute should use IDL union types to avoid using custom binding.

Source/modules/filesystem/InspectorFileSystemAgent.cpp

 /*
  * Copyright (C) 2011, 2012 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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/filesystem/InspectorFileSystemAgent.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
+#include "bindings/core/v8/UnionTypesCore.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/fileapi/File.h"
 #include "core/fileapi/FileError.h"
 #include "core/fileapi/FileReader.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/VoidCallback.h"
 #include "core/html/parser/TextResourceDecoder.h"
@@ skipping 430 matching lines @@
     Blob* blob = file->Blob::slice(m_start, m_end, IGNORE_EXCEPTION);
     m_reader->setOnload(this);
     m_reader->setOnerror(this);
 
     m_reader->readAsArrayBuffer(blob, IGNORE_EXCEPTION);
     return true;
 }
 
 void FileContentRequest::didRead()
 {
-    RefPtr<DOMArrayBuffer> buffer = m_reader->arrayBufferResult();
+    StringOrArrayBuffer resultAttribute;
+    m_reader->result(resultAttribute);
+    RefPtr<DOMArrayBuffer> buffer = resultAttribute.getAsArrayBuffer();
 
     if (!m_readAsText) {
         String result = base64Encode(static_cast<char*>(buffer->data()), buffer->byteLength());
         reportResult(static_cast<FileError::ErrorCode>(0), &result, 0);
         return;
     }
 
     OwnPtr<TextResourceDecoder> decoder = TextResourceDecoder::create(m_mimeType, m_charset, true);
     String result = decoder->decode(static_cast<char*>(buffer->data()), buffer->byteLength());
     result = result + decoder->flush();
@@ skipping 232 matching lines @@
     return 0;
 }
 
 void InspectorFileSystemAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_page);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink