Get rid of ObjectElement#svgDocument.

client/html/src/ObjectElementWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 class ObjectElementWrappingImplementation extends ElementWrappingImplementation implements ObjectElement {
   ObjectElementWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
   String get align() { return _ptr.align; }
 
   void set align(String value) { _ptr.align = value; }
@@ skipping 69 matching lines @@
   bool get willValidate() { return _ptr.willValidate; }
 
   bool checkValidity() {
     return _ptr.checkValidity();
   }
 
   void setCustomValidity(String error) {
     _ptr.setCustomValidity(error);
     return;
   }
-
-  SVGDocument get svgDocument() =>
-    LevelDom.wrapSVGDocument(_ptr.getSVGDocument());
 }