Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/AudioParam.dartdoc

-// 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 AudioParam
-interface AudioParam {
-
-  /** @domName AudioParam.defaultValue */
-  final num defaultValue;
-
-  /** @domName AudioParam.maxValue */
-  final num maxValue;
-
-  /** @domName AudioParam.minValue */
-  final num minValue;
-
-  /** @domName AudioParam.name */
-  final String name;
-
-  /** @domName AudioParam.units */
-  final int units;
-
-  /** @domName AudioParam.value */
-  num value;
-
-  /** @domName AudioParam.cancelScheduledValues */
-  void cancelScheduledValues(num startTime);
-
-  /** @domName AudioParam.exponentialRampToValueAtTime */
-  void exponentialRampToValueAtTime(num value, num time);
-
-  /** @domName AudioParam.linearRampToValueAtTime */
-  void linearRampToValueAtTime(num value, num time);
-
-  /** @domName AudioParam.setTargetValueAtTime */
-  void setTargetValueAtTime(num targetValue, num time, num timeConstant);
-
-  /** @domName AudioParam.setValueAtTime */
-  void setValueAtTime(num value, num time);
-
-  /** @domName AudioParam.setValueCurveAtTime */
-  void setValueCurveAtTime(Float32Array values, num time, num duration);
-}