Sync SVG interfaces with the specs

Source/core/svg/SVGLength.idl

Index: Source/core/svg/SVGLength.idl
diff --git a/Source/core/svg/SVGLength.idl b/Source/core/svg/SVGLength.idl
index 9e01fd4dbadab3ce5445dfe6dfaf25b503710c74..52e2daafd47f846a72010b751e74a3cef7af6d58 100644
--- a/Source/core/svg/SVGLength.idl
+++ b/Source/core/svg/SVGLength.idl
@@ -20,6 +20,9 @@
  * Boston, MA 02110-1301, USA.
  */
 
+// http://www.w3.org/TR/SVG2/types.html#InterfaceSVGLength
+
+// TODO(philipj): SVGLength should have constructors. crbug.com/366541
 [
     ImplementedAs=SVGLengthTearOff,
     SetWrapperReferenceTo(SVGElement contextElement),
@@ -43,11 +46,10 @@
 
     readonly attribute unsigned short unitType;
     [RaisesException] attribute float value;
-
     [RaisesException=Setter] attribute float valueInSpecifiedUnits;
+    // TODO(philipj): valueAsString should not have [TreatNullAs=NullString].
     [TreatNullAs=NullString, RaisesException=Setter] attribute DOMString valueAsString;
 
     [RaisesException] void newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
-
     [RaisesException] void convertToSpecifiedUnits(unsigned short unitType);
 };