setData() of DataTransfer has a void return type

Source/core/clipboard/Clipboard.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 157 matching lines @@
     if (!canReadData())
         return String();
 
     bool convertToURL = false;
     String data = m_dataObject->getData(normalizeType(type, &convertToURL));
     if (!convertToURL)
         return data;
     return convertURIListToURL(data);
 }
 
-bool Clipboard::setData(const String& type, const String& data)
+void Clipboard::setData(const String& type, const String& data)
 {
     if (!canWriteData())
-        return false;
+        return;
 
-    return m_dataObject->setData(normalizeType(type), data);
+    m_dataObject->setData(normalizeType(type), data);
 }
 
 // extensions beyond IE's API
 Vector<String> Clipboard::types() const
 {
     Vector<String> types;
     if (!canReadTypes())
         return types;
 
     ListHashSet<String> typesSet = m_dataObject->types();
@@ skipping 340 matching lines @@
     }
 }
 
 void Clipboard::trace(Visitor* visitor)
 {
     visitor->trace(m_dataObject);
     visitor->trace(m_dragImageElement);
 }
 
 } // namespace WebCore