[ABANDONED] Simplify ash shelf dimmer.

ash/common/shelf/app_list_button.cc

Index: ash/common/shelf/app_list_button.cc
diff --git a/ash/common/shelf/app_list_button.cc b/ash/common/shelf/app_list_button.cc
index 7781625be42f4dcf1ec8efdc890ac578b2477da5..c053f6b504187f9876b1f3b1cfedd4de4d5d2f1f 100644
--- a/ash/common/shelf/app_list_button.cc
+++ b/ash/common/shelf/app_list_button.cc
@@ -198,17 +198,13 @@ void AppListButton::PaintForegroundMD(gfx::Canvas* canvas,
 
 void AppListButton::PaintAppListButton(gfx::Canvas* canvas,
                                        const gfx::ImageSkia& foreground_image) {
-  int background_image_id = 0;
+  int background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL;
 
   if (WmShell::Get()->GetAppListTargetVisibility() ||
       draw_background_as_active_) {
     background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_PRESSED;
-  } else {
-    if (wm_shelf_->IsDimmed()) {
-      background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_ON_BLACK;
-    } else {
-      background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL;
-    }
+  } else if (wm_shelf_->GetBackgroundType() == SHELF_BACKGROUND_MAXIMIZED) {
+    background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_ON_BLACK;
   }
 
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();