Change PowerStatus::GetBatteryImage to not use ExtractImageRep and scale

ash/common/system/chromeos/power/power_status_view_unittest.cc

 // 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.
 
 #include "ash/common/system/chromeos/power/power_status_view.h"
 
 #include "ash/common/system/chromeos/power/power_status.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/test/ash_test_base.h"
 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
@@ skipping 34 matching lines @@
   }
 
   bool IsTimeStatusVisible() const {
     return view_->time_status_label_->visible();
   }
 
   base::string16 RemainingTimeInView() const {
     return view_->time_status_label_->text();
   }
 
-  gfx::ImageSkia GetBatteryImage() const { return view_->icon_->GetImage(); }
-
  private:
   std::unique_ptr<PowerStatusView> view_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerStatusViewTest);
 };
 
 TEST_F(PowerStatusViewTest, Basic) {
   EXPECT_FALSE(IsPercentageVisible());
   EXPECT_TRUE(IsTimeStatusVisible());
 
@@ skipping 43 matching lines @@
   // on production though.
   prop.set_external_power(PowerSupplyProperties::AC);
   prop.set_battery_state(PowerSupplyProperties::DISCHARGING);
   prop.set_battery_time_to_full_sec(120);
   UpdatePowerStatus(prop);
   EXPECT_TRUE(IsPercentageVisible());
   EXPECT_FALSE(IsTimeStatusVisible());
 }
 
 }  // namespace ash