Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/ConvolverNode.dartdoc

Index: lib/html/doc/interface/ConvolverNode.dartdoc
diff --git a/lib/html/doc/interface/ConvolverNode.dartdoc b/lib/html/doc/interface/ConvolverNode.dartdoc
deleted file mode 100644
index e62b392ec400b58fd7fc6dd9d08fc3a27d12a1d4..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/ConvolverNode.dartdoc
+++ /dev/null
@@ -1,17 +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 ConvolverNode
-interface ConvolverNode extends AudioNode {
-
-  /** @domName ConvolverNode.buffer */
-  AudioBuffer buffer;
-
-  /** @domName ConvolverNode.normalize */
-  bool normalize;
-}