Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/AudioListener.dartdoc

Index: lib/html/doc/interface/AudioListener.dartdoc
diff --git a/lib/html/doc/interface/AudioListener.dartdoc b/lib/html/doc/interface/AudioListener.dartdoc
deleted file mode 100644
index 5f3805862b50a58a078d52fd3dad65b9b26a6239..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/AudioListener.dartdoc
+++ /dev/null
@@ -1,26 +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 AudioListener
-interface AudioListener {
-
-  /** @domName AudioListener.dopplerFactor */
-  num dopplerFactor;
-
-  /** @domName AudioListener.speedOfSound */
-  num speedOfSound;
-
-  /** @domName AudioListener.setOrientation */
-  void setOrientation(num x, num y, num z, num xUp, num yUp, num zUp);
-
-  /** @domName AudioListener.setPosition */
-  void setPosition(num x, num y, num z);
-
-  /** @domName AudioListener.setVelocity */
-  void setVelocity(num x, num y, num z);
-}