Use RenderStyle::isCollapsibleWhiteSpace when renderer is available.

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 650 matching lines @@
     unsigned start = m_offset;
     unsigned end = (m_node == m_endContainer) ? static_cast<unsigned>(m_endOffset) : INT_MAX;
     while (m_textBox) {
         unsigned textBoxStart = m_textBox->start();
         unsigned runStart = max(textBoxStart, start);
 
         // Check for collapsed space at the start of this run.
         InlineTextBox* firstTextBox = renderer->containsReversedText() ? (m_sortedTextBoxes.isEmpty() ? 0 : m_sortedTextBoxes[0]) : renderer->firstTextBox();
         bool needSpace = m_lastTextNodeEndedWithCollapsedSpace
             || (m_textBox == firstTextBox && textBoxStart == runStart && runStart > 0);
-        if (needSpace && !isCollapsibleWhitespace(m_lastCharacter) && m_lastCharacter) {
+        if (needSpace && !renderer->style()->isCollapsibleWhiteSpace(m_lastCharacter) && m_lastCharacter) {
             if (m_lastTextNode == m_node && runStart > 0 && str[runStart - 1] == ' ') {
                 unsigned spaceRunStart = runStart - 1;
                 while (spaceRunStart > 0 && str[spaceRunStart - 1] == ' ')
                     --spaceRunStart;
                 emitText(m_node, renderer, spaceRunStart, spaceRunStart + 1);
             } else {
                 emitCharacter(' ', m_node, 0, runStart, runStart);
             }
             return;
         }
@@ skipping 1477 matching lines @@
             const Position& collapseTo = options & Backwards ? start : end;
             return Range::create(*start.document(), collapseTo, collapseTo);
         }
     }
 
     CharacterIterator computeRangeIterator(start, end, iteratorFlagsForFindPlainText);
     return characterSubrange(computeRangeIterator, matchStart, matchLength);
 }
 
 }