Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/SVGLineElement.dartdoc

Index: lib/html/doc/interface/SVGLineElement.dartdoc
diff --git a/lib/html/doc/interface/SVGLineElement.dartdoc b/lib/html/doc/interface/SVGLineElement.dartdoc
deleted file mode 100644
index 247a7499273fa03835faf6b367cd66d02ee85132..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/SVGLineElement.dartdoc
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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.
-
-// WARNING:
-//   This file contains documentation that is merged into the real source.
-//   Do not make code changes here.
-
-/// @domName SVGLineElement
-interface SVGLineElement extends SVGElement, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGTransformable {
-
-  /** @domName SVGLineElement.x1 */
-  final SVGAnimatedLength x1;
-
-  /** @domName SVGLineElement.x2 */
-  final SVGAnimatedLength x2;
-
-  /** @domName SVGLineElement.y1 */
-  final SVGAnimatedLength y1;
-
-  /** @domName SVGLineElement.y2 */
-  final SVGAnimatedLength y2;
-}