Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/BatteryManager.dartdoc

Index: lib/html/doc/interface/BatteryManager.dartdoc
diff --git a/lib/html/doc/interface/BatteryManager.dartdoc b/lib/html/doc/interface/BatteryManager.dartdoc
deleted file mode 100644
index e24650acbb1c9e802aca2806a680253e2691ae76..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/BatteryManager.dartdoc
+++ /dev/null
@@ -1,48 +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 BatteryManager
-interface BatteryManager extends EventTarget {
-
-  /**
-   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
-   */
-  BatteryManagerEvents get on();
-
-  /** @domName BatteryManager.charging */
-  final bool charging;
-
-  /** @domName BatteryManager.chargingTime */
-  final num chargingTime;
-
-  /** @domName BatteryManager.dischargingTime */
-  final num dischargingTime;
-
-  /** @domName BatteryManager.level */
-  final num level;
-
-  /** @domName BatteryManager.addEventListener */
-  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
-
-  /** @domName BatteryManager.dispatchEvent */
-  bool $dom_dispatchEvent(Event evt);
-
-  /** @domName BatteryManager.removeEventListener */
-  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
-}
-
-interface BatteryManagerEvents extends Events {
-
-  EventListenerList get chargingChange();
-
-  EventListenerList get chargingTimeChange();
-
-  EventListenerList get dischargingTimeChange();
-
-  EventListenerList get levelChange();
-}