Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/BiquadFilterNode.dartdoc

Index: lib/html/doc/interface/BiquadFilterNode.dartdoc
diff --git a/lib/html/doc/interface/BiquadFilterNode.dartdoc b/lib/html/doc/interface/BiquadFilterNode.dartdoc
deleted file mode 100644
index a06a4f41b29055d946038f64222dc7e907d6682d..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/BiquadFilterNode.dartdoc
+++ /dev/null
@@ -1,42 +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 BiquadFilterNode
-interface BiquadFilterNode extends AudioNode {
-
-  static final int ALLPASS = 7;
-
-  static final int BANDPASS = 2;
-
-  static final int HIGHPASS = 1;
-
-  static final int HIGHSHELF = 4;
-
-  static final int LOWPASS = 0;
-
-  static final int LOWSHELF = 3;
-
-  static final int NOTCH = 6;
-
-  static final int PEAKING = 5;
-
-  /** @domName BiquadFilterNode.Q */
-  final AudioParam Q;
-
-  /** @domName BiquadFilterNode.frequency */
-  final AudioParam frequency;
-
-  /** @domName BiquadFilterNode.gain */
-  final AudioParam gain;
-
-  /** @domName BiquadFilterNode.type */
-  int type;
-
-  /** @domName BiquadFilterNode.getFrequencyResponse */
-  void getFrequencyResponse(Float32Array frequencyHz, Float32Array magResponse, Float32Array phaseResponse);
-}