setData() of DataTransfer has a void return type

Source/core/clipboard/DataObject.cpp

 /*
  * Copyright (c) 2008, 2009, 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 134 matching lines @@
 
 String DataObject::getData(const String& type) const
 {
     for (size_t i = 0; i < m_itemList.size(); ++i)  {
         if (m_itemList[i]->kind() == DataObjectItem::StringKind && m_itemList[i]->type() == type)
             return m_itemList[i]->getAsString();
     }
     return String();
 }
 
-bool DataObject::setData(const String& type, const String& data)
+void DataObject::setData(const String& type, const String& data)
 {
     clearData(type);
     if (!add(data, type))
         ASSERT_NOT_REACHED();
-    return true;
 }
 
 void DataObject::urlAndTitle(String& url, String* title) const
 {
     RefPtrWillBeRawPtr<DataObjectItem> item = findStringItem(mimeTypeTextURIList);
     if (!item)
         return;
     url = convertURIListToURL(item->getAsString());
     if (title)
         *title = item->title();
@@ skipping 87 matching lines @@
     m_itemList.append(item);
 }
 
 void DataObject::trace(Visitor* visitor)
 {
     visitor->trace(m_itemList);
     WillBeHeapSupplementable<DataObject>::trace(visitor);
 }
 
 } // namespace WebCore