Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/ValidityState.dartdoc

Index: lib/html/doc/interface/ValidityState.dartdoc
diff --git a/lib/html/doc/interface/ValidityState.dartdoc b/lib/html/doc/interface/ValidityState.dartdoc
deleted file mode 100644
index 6e7e7032f66cd6d8026222c9b31c17489ff0512c..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/ValidityState.dartdoc
+++ /dev/null
@@ -1,38 +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 ValidityState
-interface ValidityState {
-
-  /** @domName ValidityState.customError */
-  final bool customError;
-
-  /** @domName ValidityState.patternMismatch */
-  final bool patternMismatch;
-
-  /** @domName ValidityState.rangeOverflow */
-  final bool rangeOverflow;
-
-  /** @domName ValidityState.rangeUnderflow */
-  final bool rangeUnderflow;
-
-  /** @domName ValidityState.stepMismatch */
-  final bool stepMismatch;
-
-  /** @domName ValidityState.tooLong */
-  final bool tooLong;
-
-  /** @domName ValidityState.typeMismatch */
-  final bool typeMismatch;
-
-  /** @domName ValidityState.valid */
-  final bool valid;
-
-  /** @domName ValidityState.valueMissing */
-  final bool valueMissing;
-}