[ABANDONED] Simplify ash shelf dimmer.

ash/common/system/tray/tray_background_view.cc

Index: ash/common/system/tray/tray_background_view.cc
diff --git a/ash/common/system/tray/tray_background_view.cc b/ash/common/system/tray/tray_background_view.cc
index 569e939369e26c480a368488596996bd1150bdf7..62e81530c0f599f134f81d060df642b9d5ca4994 100644
--- a/ash/common/system/tray/tray_background_view.cc
+++ b/ash/common/system/tray/tray_background_view.cc
@@ -145,10 +145,8 @@ class TrayBackground : public views::Background {
     int state = kImageTypeDefault;
     if (tray_background_view_->draw_background_as_active())
       state = kImageTypePressed;
-    else if (shelf->IsDimmed())
+    else if (shelf->GetBackgroundType() == SHELF_BACKGROUND_MAXIMIZED)
       state = kImageTypeOnBlack;
-    else
-      state = kImageTypeDefault;
 
     ui::CreateNineImagePainter(kImages[orientation][state])
         ->Paint(canvas, view->GetLocalBounds());