Fix the volume strength icon to reflect the volume control clicks

ash/common/system/chromeos/audio/volume_view.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 ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/slider.h"
@@ skipping 28 matching lines @@
   ~VolumeView() override;
 
   void Update();
 
   // Sets volume level on slider_, |percent| is ranged from [0.00] to [1.00].
   void SetVolumeLevel(float percent);
 
  private:
   // Updates device_type_ icon and more_ button.
   void UpdateDeviceTypeAndMore();
-  void HandleVolumeUp(float percent);
-  void HandleVolumeDown(float percent);
+  void HandleVolumeUp(int percent);
+  void HandleVolumeDown(int percent);
 
   // SliderListener:
   void SliderValueChanged(views::Slider* sender,
                           float value,
                           float old_value,
                           views::SliderChangeReason reason) override;
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
@@ skipping 13 matching lines @@
   views::ImageView* device_type_;
   bool is_default_view_;
 
   DISALLOW_COPY_AND_ASSIGN(VolumeView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_