[SVG] SVGLength{,List} migration to new SVG property impl.

Source/core/svg/SVGTextContentElement.h

Index: Source/core/svg/SVGTextContentElement.h
diff --git a/Source/core/svg/SVGTextContentElement.h b/Source/core/svg/SVGTextContentElement.h
index db0b622d8b94d20a2541d8d1a26c4330edddeed8..98b89da4434875697e3a55c4f6b1e4305315f9ff 100644
--- a/Source/core/svg/SVGTextContentElement.h
+++ b/Source/core/svg/SVGTextContentElement.h
@@ -66,6 +66,8 @@ struct SVGPropertyTraits<SVGLengthAdjustType> {
     }
 };
 
+class SVGAnimatedTextLength;
+
 class SVGTextContentElement : public SVGGraphicsElement,
                               public SVGExternalResourcesRequired {
 public:
@@ -88,11 +90,8 @@ public:
 
     static SVGTextContentElement* elementFromRenderer(RenderObject*);
 
-    // textLength is not declared using the standard DECLARE_ANIMATED_LENGTH macro
-    // as its getter needs special handling (return getComputedTextLength(), instead of m_textLength).
-    SVGLength& specifiedTextLength() { return m_specifiedTextLength; }
-    PassRefPtr<SVGAnimatedLength> textLength();
-    static const SVGPropertyInfo* textLengthPropertyInfo();
+    SVGAnimatedLength* textLength() { return m_textLength.get(); }
+    bool textLengthIsSpecifiedByUser() { return m_textLengthIsSpecifiedByUser; }
 
 protected:
     SVGTextContentElement(const QualifiedName&, Document&);
@@ -110,12 +109,8 @@ protected:
 private:
     virtual bool isTextContent() const { return true; }
 
-    // Custom 'textLength' property
-    static void synchronizeTextLength(SVGElement* contextElement);
-    static PassRefPtr<SVGAnimatedProperty> lookupOrCreateTextLengthWrapper(SVGElement* contextElement);
-    mutable SVGSynchronizableAnimatedProperty<SVGLength> m_textLength;
-    SVGLength m_specifiedTextLength;
-
+    RefPtr<SVGAnimatedLength> m_textLength;
+    bool m_textLengthIsSpecifiedByUser;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGTextContentElement)
         DECLARE_ANIMATED_ENUMERATION(LengthAdjust, lengthAdjust, SVGLengthAdjustType)
         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)