Remove stale files from lib/html/src.

lib/html/src/SVGElement.dart

Index: lib/html/src/SVGElement.dart
diff --git a/lib/html/src/SVGElement.dart b/lib/html/src/SVGElement.dart
deleted file mode 100644
index e2692a20572d050ec4f47ff30e24ad3dcde45b9e..0000000000000000000000000000000000000000
--- a/lib/html/src/SVGElement.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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.
-
-interface SVGElement extends Element default SVGElementWrappingImplementation {
-
-  SVGElement.tag(String tag);
-  SVGElement.svg(String svg);
-
-  String get id();
-
-  void set id(String value);
-
-  SVGSVGElement get ownerSVGElement();
-
-  SVGElement get viewportElement();
-
-  String get xmlbase();
-
-  void set xmlbase(String value);
-
-  SVGElement clone(bool deep);
-}