Remove Battery Status API support code from Blink

Source/modules/battery/BatteryClient.h

-/*
- *  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.
- */
-
-#ifndef BatteryClient_h
-#define BatteryClient_h
-
-#if ENABLE(BATTERY_STATUS)
-
-namespace WebCore {
-
-class Page;
-
-class BatteryClient {
-public:
-    virtual ~BatteryClient() { }
-
-    virtual void startUpdating() = 0;
-    virtual void stopUpdating() = 0;
-    virtual void batteryControllerDestroyed() = 0;
-};
-
-void provideBatteryTo(Page*, BatteryClient*);
-
-}
-
-#endif // BATTERY_STATUS
-#endif // BatteryClient_h
-