Move and rename RenderPart to LayoutPart.

Source/core/editing/iterators/TextIterator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov.
  *
  * 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 284 matching lines @@
                     continue;
                 }
                 m_iterationProgress = HandledUserAgentShadowRoot;
             }
 
             // Handle the current node according to its type.
             if (m_iterationProgress < HandledNode) {
                 bool handledNode = false;
                 if (renderer->isText() && m_node->nodeType() == Node::TEXT_NODE) { // FIXME: What about CDATA_SECTION_NODE?
                     handledNode = handleTextNode();
-                } else if (renderer && (renderer->isImage() || renderer->isRenderPart()
+                } else if (renderer && (renderer->isImage() || renderer->isLayoutPart()
                     || (m_node && m_node->isHTMLElement()
                     && (isHTMLFormControlElement(toHTMLElement(*m_node))
                     || isHTMLLegendElement(toHTMLElement(*m_node))
                     || isHTMLImageElement(toHTMLElement(*m_node))
                     || isHTMLMeterElement(toHTMLElement(*m_node))
                     || isHTMLProgressElement(toHTMLElement(*m_node)))))) {
                     handledNode = handleReplacedElement();
                 } else {
                     handledNode = handleNonTextNode();
                 }
@@ skipping 861 matching lines @@
     return createPlainText(it);
 }
 
 String plainText(const Position& start, const Position& end, TextIteratorBehaviorFlags behavior)
 {
     TextIterator it(start, end, behavior);
     return createPlainText(it);
 }
 
 }