Fix issue where iframe content wasn't included in the accessibility tree.

Source/core/accessibility/AccessibilityRenderObject.cpp

 /*
 * Copyright (C) 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
@@ skipping 505 matching lines @@
 //
 
 bool AccessibilityRenderObject::isAttachment() const
 {
     RenderBoxModelObject* renderer = renderBoxModelObject();
     if (!renderer)
         return false;
     // Widgets are the replaced elements that we represent to AX as attachments
     bool isWidget = renderer->isWidget();
     ASSERT(!isWidget || (renderer->isReplaced() && !isImage()));
-    return isWidget && ariaRoleAttribute() == UnknownRole;
+    return isWidget;
 }
 
 bool AccessibilityRenderObject::isFileUploadButton() const
 {
     if (m_renderer && m_renderer->node() && m_renderer->node()->hasTagName(inputTag)) {
         HTMLInputElement* input = static_cast<HTMLInputElement*>(m_renderer->node());
         return input->isFileUpload();
     }
 
     return false;
@@ skipping 2654 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace WebCore