Revert of Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/Source/platform/battery/battery_dispatcher_proxy.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
-#define BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
-
-#include "device/battery/battery_monitor.mojom.h"
-#include "platform/PlatformExport.h"
-#include "wtf/Noncopyable.h"
-
-namespace blink {
-
-class BatteryStatus;
-
-// This class connects a BatteryDispatcherProxy::Listener to the underlying Mojo
-// service.  Note that currently the access to the Mojo service is limited in
-// platform/.  In future, we'll let classes in core/ and modules/ directly
-// communicate with Mojo, and then, there will be no need to use this proxy
-// class.
-//
-// TODO(yukishiino): Remove this class once Mojo supports WTF-types.
-class PLATFORM_EXPORT BatteryDispatcherProxy {
-  WTF_MAKE_NONCOPYABLE(BatteryDispatcherProxy);
- public:
-  class PLATFORM_EXPORT Listener {
-   public:
-    virtual ~Listener() = default;
-
-    // This method is called when a new battery status is available.
-    virtual void OnUpdateBatteryStatus(const BatteryStatus&) = 0;
-  };
-
-  explicit BatteryDispatcherProxy(Listener*);
-  ~BatteryDispatcherProxy();
-
-  void StartListening();
-  void StopListening();
-
- private:
-  void QueryNextStatus();
-  void OnDidChange(device::BatteryStatusPtr);
-
-  device::BatteryMonitorPtr monitor_;
-  Listener* listener_;
-
-  friend class BatteryDispatcherProxyTest;
-};
-
-}  // namespace blink
-
-#endif  // BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_