Change PowerStatus::GetBatteryImage to not use ExtractImageRep and scale

ash/common/system/chromeos/power/power_status_view.h

Index: ash/common/system/chromeos/power/power_status_view.h
diff --git a/ash/common/system/chromeos/power/power_status_view.h b/ash/common/system/chromeos/power/power_status_view.h
index 1cd5cee9ac3bdda601bdbc68555687badb33f699..75b95f508cdbca7ddfaf5e326249f5211045754f 100644
--- a/ash/common/system/chromeos/power/power_status_view.h
+++ b/ash/common/system/chromeos/power/power_status_view.h
@@ -12,7 +12,6 @@
 #include "ui/views/view.h"
 
 namespace views {
-class ImageView;
 class Label;
 }
 
@@ -48,13 +47,6 @@ class ASH_EXPORT PowerStatusView : public views::View,
   views::Label* separator_label_;
   views::Label* time_status_label_;
 
-  // Battery status indicator icon. Unused in material design.
-  views::ImageView* icon_;
-
-  // Information about the image last used to update |icon_|. Cached to avoid
-  // unnecessary updates (http://crbug.com/589348).
-  PowerStatus::BatteryImageInfo previous_battery_image_info_;
-
   // Only used in material design.
   base::string16 accessible_name_;