Remove Battery Status API support code from Blink

Source/modules/battery/BatteryManager.idl

-/*
- *  Copyright (C) 2012 Samsung Electronics
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Library General Public
- *  License as published by the Free Software Foundation; either
- *  version 2 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Library General Public License for more details.
- *
- *  You should have received a copy of the GNU Library General Public License
- *  along with this library; see the file COPYING.LIB.  If not, write to
- *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- *  Boston, MA 02110-1301, USA.
- */
-
-// http://dev.w3.org/2009/dap/system-info/battery-status.html
-[
-    NoInterfaceObject,
-    Conditional=BATTERY_STATUS,
-    ActiveDOMObject,
-    EventTarget
- ] interface BatteryManager {
-    readonly attribute boolean charging;
-    readonly attribute double chargingTime;
-    readonly attribute double dischargingTime;
-    readonly attribute double level;
-
-    attribute EventListener onchargingchange;
-    attribute EventListener onchargingtimechange;
-    attribute EventListener ondischargingtimechange;
-    attribute EventListener onlevelchange;
-
-    // EventTarget interface
-    void addEventListener(DOMString type,
-                          EventListener listener,
-                          optional boolean useCapture);
-    void removeEventListener(DOMString type,
-                             EventListener listener,
-                             optional boolean useCapture);
-    [RaisesException] boolean dispatchEvent(Event event);
-};
-