Minor refactoring of code in TextIterator

Source/core/editing/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 384 matching lines @@
                 }
                 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->isWidget()
-                    || (renderer->node() && renderer->node()->isElementNode()
-                    && (toElement(renderer->node())->isFormControlElement()
-                    || toElement(renderer->node())->hasTagName(legendTag)
-                    || toElement(renderer->node())->hasTagName(meterTag)
-                    || toElement(renderer->node())->hasTagName(progressTag))))) {
+                    || (m_node && m_node->isElementNode()
+                    && (toElement(m_node)->isFormControlElement()
+                    || toElement(m_node)->hasTagName(legendTag)
+                    || toElement(m_node)->hasTagName(meterTag)
+                    || toElement(m_node)->hasTagName(progressTag))))) {
                     handledNode = handleReplacedElement();
                 } else {
                     handledNode = handleNonTextNode();
                 }
                 if (handledNode)
                     m_iterationProgress = HandledNode;
                 if (m_positionNode)
                     return;
             }
         }
@@ skipping 1970 matching lines @@
         if (!matchLength)
             return collapsedToBoundary(range, !(options & Backwards));
     }
 
     // Then, find the document position of the start and the end of the text.
     CharacterIterator computeRangeIterator(range, TextIteratorEntersTextControls);
     return characterSubrange(computeRangeIterator, matchStart, matchLength);
 }
 
 }