Resurrect battery_status_dispatcher_unittest.

content/renderer/battery_status/battery_status_dispatcher.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 CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
 #define CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "device/battery/battery_monitor.mojom.h"
 
 namespace blink {
 class WebBatteryStatusListener;
 }
 
 namespace content {
 
 class CONTENT_EXPORT BatteryStatusDispatcher
     : public NON_EXPORTED_BASE(device::BatteryStatusObserver) {
  public:
   explicit BatteryStatusDispatcher(blink::WebBatteryStatusListener* listener);
   ~BatteryStatusDispatcher() override;
 
  private:
+  friend class BatteryStatusDispatcherTest;
+
   // BatteryStatusObserver method.
   void DidChange(device::BatteryStatusPtr battery_status) override;
 
-  void Start();
-  void Stop();
-
   device::BatteryMonitorPtr monitor_;
   blink::WebBatteryStatusListener* listener_;
 
   DISALLOW_COPY_AND_ASSIGN(BatteryStatusDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_