Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/FieldSetElement.dartdoc

Index: lib/html/doc/interface/FieldSetElement.dartdoc
diff --git a/lib/html/doc/interface/FieldSetElement.dartdoc b/lib/html/doc/interface/FieldSetElement.dartdoc
deleted file mode 100644
index 1e0479ed2d9d84b8de7a5ad73ebabc93680528bc..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/FieldSetElement.dartdoc
+++ /dev/null
@@ -1,43 +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 HTMLFieldSetElement
-interface FieldSetElement extends Element default _Elements {
-
-  FieldSetElement();
-
-  /** @domName HTMLFieldSetElement.disabled */
-  bool disabled;
-
-  /** @domName HTMLFieldSetElement.elements */
-  final HTMLCollection elements;
-
-  /** @domName HTMLFieldSetElement.form */
-  final FormElement form;
-
-  /** @domName HTMLFieldSetElement.name */
-  String name;
-
-  /** @domName HTMLFieldSetElement.type */
-  final String type;
-
-  /** @domName HTMLFieldSetElement.validationMessage */
-  final String validationMessage;
-
-  /** @domName HTMLFieldSetElement.validity */
-  final ValidityState validity;
-
-  /** @domName HTMLFieldSetElement.willValidate */
-  final bool willValidate;
-
-  /** @domName HTMLFieldSetElement.checkValidity */
-  bool checkValidity();
-
-  /** @domName HTMLFieldSetElement.setCustomValidity */
-  void setCustomValidity(String error);
-}