Remove more API from Node and ContainerNode.

sky/engine/core/editing/markup.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 201 matching lines @@
     if (range && textNode == range->endContainer())
         endOffset = range->endOffset();
 
     Position start = createLegacyEditingPosition(&textNode, startOffset);
     Position end = createLegacyEditingPosition(&textNode, endOffset);
     return plainText(Range::create(textNode.document(), start, end).get());
 }
 
 String StyledMarkupAccumulator::stringValueForRange(const Node& node, const Range* range)
 {
+    if (!node.isTextNode())
+        return emptyString();
+    String text = toText(node).data();
     if (!range)
-        return node.nodeValue();
-
-    String str = node.nodeValue();
+        return text;
     if (node == range->endContainer())
-        str.truncate(range->endOffset());
+        text.truncate(range->endOffset());
     if (node == range->startContainer())
-        str.remove(0, range->startOffset());
-    return str;
+        text.remove(0, range->startOffset());
+    return text;
 }
 
 void StyledMarkupAccumulator::appendElement(StringBuilder& out, Element& element, bool addDisplayInline, RangeFullySelectsNode rangeFullySelectsNode)
 {
     const bool documentIsHTML = element.document().isHTMLDocument();
     appendOpenTag(out, element, 0);
 
     const bool shouldAnnotateOrForceInline = element.isHTMLElement() && (shouldAnnotate() || addDisplayInline);
     const bool shouldOverrideStyleAttr = shouldAnnotateOrForceInline || shouldApplyWrappingStyle(element);
 
@@ skipping 332 matching lines @@
     if (!next || !next->isTextNode())
         return;
 
     RefPtr<Text> textNext = toText(next);
     textNode->appendData(textNext->data());
     if (textNext->parentNode()) // Might have been removed by mutation event.
         textNext->remove(exceptionState);
 }
 
 }