[SVG] SVGAnimatedRect migration to new SVG property impl.

Source/core/svg/SVGTextContentElement.cpp

Index: Source/core/svg/SVGTextContentElement.cpp
diff --git a/Source/core/svg/SVGTextContentElement.cpp b/Source/core/svg/SVGTextContentElement.cpp
index a0ffd03c43dcfaf1a1881264cf2049c3f574ace5..620345e4b5a679e018110c1028bc20210b19d65b 100644
--- a/Source/core/svg/SVGTextContentElement.cpp
+++ b/Source/core/svg/SVGTextContentElement.cpp
@@ -134,16 +134,17 @@ SVGPoint SVGTextContentElement::getEndPositionOfChar(unsigned charnum, Exception
     return SVGTextQuery(renderer()).endPositionOfCharacter(charnum);
 }
 
-SVGRect SVGTextContentElement::getExtentOfChar(unsigned charnum, ExceptionState& exceptionState)
+PassRefPtr<SVGRectTearOff> SVGTextContentElement::getExtentOfChar(unsigned charnum, ExceptionState& exceptionState)
 {
     document().updateLayoutIgnorePendingStylesheets();
 
     if (charnum > getNumberOfChars()) {
         exceptionState.throwUninformativeAndGenericDOMException(IndexSizeError);
-        return SVGRect();
+        return 0;
     }
 
-    return SVGTextQuery(renderer()).extentOfCharacter(charnum);
+    FloatRect rect = SVGTextQuery(renderer()).extentOfCharacter(charnum);
+    return SVGRectTearOff::create(SVGRect::create(rect), 0, PropertyIsNotAnimVal);
 }
 
 float SVGTextContentElement::getRotationOfChar(unsigned charnum, ExceptionState& exceptionState)