Use RenderStyle::isCollapsibleWhiteSpace when renderer is available.

Source/core/editing/htmlediting.h

 /*
  * Copyright (C) 2004, 2006, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 227 matching lines @@
 
 Position adjustedSelectionStartForStyleComputation(const VisibleSelection&);
 
 
 // Miscellaneous functions on Text
 inline bool isWhitespace(UChar c)
 {
     return c == noBreakSpace || c == ' ' || c == '\n' || c == '\t';
 }
 
+// FIXME: Can't really answer this question correctly without knowing the white-space mode.
+inline bool isCollapsibleWhitespace(UChar c)
+{
+    return c == ' ' || c == '\n';
+}
+
 inline bool isAmbiguousBoundaryCharacter(UChar character)
 {
     // These are characters that can behave as word boundaries, but can appear within words.
     // If they are just typed, i.e. if they are immediately followed by a caret, we want to delay text checking until the next character has been typed.
     // FIXME: this is required until 6853027 is fixed and text checking can do this for us.
     return character == '\'' || character == rightSingleQuotationMark || character == hebrewPunctuationGershayim;
 }
 
 String stringWithRebalancedWhitespace(const String&, bool startIsStartOfParagraph, bool endIsEndOfParagraph);
 const String& nonBreakingSpaceString();
 
 }
 
 #endif