ash uber tray: Update the volume icon for various levels of volumes.

ash/system/brightness/tray_brightness.h

Index: ash/system/brightness/tray_brightness.h
diff --git a/ash/system/brightness/tray_brightness.h b/ash/system/brightness/tray_brightness.h
index c94bd9c910fbfd1a51afefea58423b954ac91b6e..420be90ff11cec2682f58fa22575efd8e6e7093e 100644
--- a/ash/system/brightness/tray_brightness.h
+++ b/ash/system/brightness/tray_brightness.h
@@ -10,13 +10,13 @@
 #include "ash/system/tray/system_tray_item.h"
 #include "base/compiler_specific.h"
 
+namespace ash {
+namespace internal {
+
 namespace tray {
 class BrightnessView;
 }
 
-namespace ash {
-namespace internal {
-
 class TrayBrightness : public SystemTrayItem,
                        public BrightnessController {
  public:
@@ -24,7 +24,7 @@ class TrayBrightness : public SystemTrayItem,
   virtual ~TrayBrightness();
 
  private:
-  // Overridden from SystemTrayItem
+  // Overridden from SystemTrayItem.
   virtual views::View* CreateTrayView() OVERRIDE;
   virtual views::View* CreateDefaultView() OVERRIDE;
   virtual views::View* CreateDetailedView() OVERRIDE;