Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/SVGFEOffsetElement.dartdoc

Index: lib/html/doc/interface/SVGFEOffsetElement.dartdoc
diff --git a/lib/html/doc/interface/SVGFEOffsetElement.dartdoc b/lib/html/doc/interface/SVGFEOffsetElement.dartdoc
deleted file mode 100644
index ce0db579e2a8a1f895b3db43934098b4da1f582f..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/SVGFEOffsetElement.dartdoc
+++ /dev/null
@@ -1,20 +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 SVGFEOffsetElement
-interface SVGFEOffsetElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
-
-  /** @domName SVGFEOffsetElement.dx */
-  final SVGAnimatedNumber dx;
-
-  /** @domName SVGFEOffsetElement.dy */
-  final SVGAnimatedNumber dy;
-
-  /** @domName SVGFEOffsetElement.in1 */
-  final SVGAnimatedString in1;
-}