Revert of Draggable peeking/fullscreen launcher with transparent background.

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 7c3731a32cc7297f96d06b73470c0005b7041292..7e66fb2914c888be06bc909c871ef7a9e0b725f5 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -64,6 +64,7 @@
 
   // Clears internal data for shutdown process.
   void PrepareForShutdown();
+
   // Returns whether the shelf and its contents (shelf, status) are visible
   // on the screen.
   bool IsVisible() const;
@@ -137,8 +138,6 @@
   void OnPinnedStateChanged(aura::Window* pinned_window) override;
   void OnVirtualKeyboardStateChanged(bool activated,
                                      aura::Window* root_window) override;
-  void OnAppListVisibilityChanged(bool shown,
-                                  aura::Window* root_window) override;
 
   // Overridden from wm::ActivationChangeObserver:
   void OnWindowActivated(ActivationReason reason,
@@ -318,10 +317,6 @@
   // Do any windows overlap the shelf? This is maintained by WorkspaceManager.
   bool window_overlaps_shelf_;
 
-  // Is the AppList visible? This is maintained by
-  // OnAppListVisibilityChanged.
-  bool is_app_list_visible_ = false;
-
   base::OneShotTimer auto_hide_timer_;
 
   // Whether the mouse was over the shelf when the auto hide timer started.