Remove unused LauncherItemController::IsVisible()

chrome/browser/ui/ash/launcher/launcher_item_controller.h

Index: chrome/browser/ui/ash/launcher/launcher_item_controller.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_item_controller.h b/chrome/browser/ui/ash/launcher/launcher_item_controller.h
index 52c3c280f9e53e6db5e1e997168afa8c30eebcb3..b2b1c08572a7f793fb6955b14cb27fe42ce5d6cc 100644
--- a/chrome/browser/ui/ash/launcher/launcher_item_controller.h
+++ b/chrome/browser/ui/ash/launcher/launcher_item_controller.h
@@ -50,9 +50,6 @@ class LauncherItemController : public ash::ShelfItemDelegate {
     image_set_by_controller_ = image_set_by_controller;
   }
 
-  // Returns true if this item is visible (e.g. not minimized).
-  virtual bool IsVisible() const = 0;
-
   // Launches a new instance of the app associated with this item.
   virtual void Launch(ash::LaunchSource source, int event_flags) = 0;