Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/PointerLock.dartdoc

Index: lib/html/doc/interface/PointerLock.dartdoc
diff --git a/lib/html/doc/interface/PointerLock.dartdoc b/lib/html/doc/interface/PointerLock.dartdoc
deleted file mode 100644
index 0617855c50fb688d093a2fbc760870eef697c82a..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/PointerLock.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 PointerLock
-interface PointerLock {
-
-  /** @domName PointerLock.isLocked */
-  final bool isLocked;
-
-  /** @domName PointerLock.lock */
-  void lock(Element target, [VoidCallback successCallback, VoidCallback failureCallback]);
-
-  /** @domName PointerLock.unlock */
-  void unlock();
-}