Add a couple useful SVG constructors.

client/html/src/SVGSVGElement.dart

Index: client/html/src/SVGSVGElement.dart
diff --git a/client/html/generated/src/interface/SVGSVGElement.dart b/client/html/src/SVGSVGElement.dart
similarity index 95%
rename from client/html/generated/src/interface/SVGSVGElement.dart
rename to client/html/src/SVGSVGElement.dart
index 8c8683539deae8acf7184d6b60fe57865a699715..1b841273d668d6c0907be15aae5ef57a38126c4e 100644
--- a/client/html/generated/src/interface/SVGSVGElement.dart
+++ b/client/html/src/SVGSVGElement.dart
@@ -2,9 +2,10 @@
 // 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.
 
-// WARNING: Do not edit - generated code.
+interface SVGSVGElement extends SVGElement, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGLocatable, SVGFitToViewBox, SVGZoomAndPan
+    factory SVGSVGElementWrappingImplementation {
 
-interface SVGSVGElement extends SVGElement, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGLocatable, SVGFitToViewBox, SVGZoomAndPan {
+  SVGSVGElement();
 
   String get contentScriptType();