Merging dart:html interfaces and implementations

lib/html/templates/html/interface/interface_SVGSVGElement.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
 
 $!COMMENT
-abstract class SVGSVGElement extends SVGElement implements SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGLocatable, SVGFitToViewBox, SVGZoomAndPan {
-  factory SVGSVGElement() => _$(ID)FactoryProvider.createSVGSVGElement();
+abstract class _ISVGSVGElement extends _ISVGElement implements _ISVGTests, _ISVGLangSpace, _ISVGExternalResourcesRequired, _ISVGStylable, _ISVGLocatable, _ISVGFitToViewBox, _ISVGZoomAndPan {
 
 $!MEMBERS
 }