Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/html/PluginDocument.cpp

 /*
  * Copyright (C) 2006, 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 81 matching lines @@
     RefPtr<HTMLBodyElement> body = HTMLBodyElement::create(*document());
     body->setAttribute(marginwidthAttr, "0");
     body->setAttribute(marginheightAttr, "0");
     body->setAttribute(styleAttr, "background-color: rgb(38,38,38)");
     rootElement->appendChild(body);
 
     m_embedElement = HTMLEmbedElement::create(*document());
     m_embedElement->setAttribute(widthAttr, "100%");
     m_embedElement->setAttribute(heightAttr, "100%");
     m_embedElement->setAttribute(nameAttr, "plugin");
-    m_embedElement->setAttribute(srcAttr, document()->url().string());
+    m_embedElement->setAttribute(srcAttr, AtomicString(document()->url().string()));
     m_embedElement->setAttribute(typeAttr, document()->loader()->mimeType());
     body->appendChild(m_embedElement);
 
     toPluginDocument(document())->setPluginNode(m_embedElement.get());
 
     document()->updateLayout();
 
     // We need the plugin to load synchronously so we can get the PluginView
     // below so flush the layout tasks now instead of waiting on the timer.
     frame->view()->flushAnyPendingPostLayoutTasks();
@@ skipping 75 matching lines @@
     // with how many times we call beforeload on object elements. <rdar://problem/8441094>.
     if (!shouldLoadPluginManually())
         return;
 
     DocumentLoader* documentLoader = frame()->loader().activeDocumentLoader();
     documentLoader->cancelMainResourceLoad(ResourceError::cancelledError(documentLoader->request().url()));
     setShouldLoadPluginManually(false);
 }
 
 }