Use RenderStyle::isCollapsibleWhiteSpace when renderer is available.

Source/core/editing/TextIterator.h

 /*
  * Copyright (C) 2004, 2006, 2009 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 30 matching lines @@
     TextIteratorEmitsCharactersBetweenAllVisiblePositions = 1 << 0,
     TextIteratorEntersTextControls = 1 << 1,
     TextIteratorIgnoresStyleVisibility = 1 << 2,
     TextIteratorEmitsOriginalText = 1 << 3,
     TextIteratorStopsOnFormControls = 1 << 4,
     TextIteratorEmitsImageAltText = 1 << 5,
     TextIteratorEntersAuthorShadowRoots = 1 << 6
 };
 typedef unsigned TextIteratorBehaviorFlags;
 
-// FIXME: Can't really answer this question correctly without knowing the white-space mode.
-// FIXME: Move this somewhere else in the editing directory. It doesn't belong here.
-inline bool isCollapsibleWhitespace(UChar c)
-{
-    switch (c) {
-        case ' ':
-        case '\n':
-            return true;
-        default:
-            return false;
-    }
-}
-
 String plainText(const Range*, TextIteratorBehaviorFlags = TextIteratorDefaultBehavior);
 PassRefPtr<Range> findPlainText(const Range*, const String&, FindOptions);
 PassRefPtr<Range> findPlainText(const Position& start, const Position& end, const String&, FindOptions);
 
 class BitStack {
 public:
     BitStack();
     ~BitStack();
 
     void push(bool);
@@ skipping 297 matching lines @@
     Vector<UChar> m_buffer;
     // Did we have to look ahead in the textIterator to confirm the current chunk?
     bool m_didLookAhead;
     RefPtr<Range> m_range;
     TextIterator m_textIterator;
 };
 
 }
 
 #endif