Remove docked windows entirely in M59.

ash/root_window_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 33 matching lines @@
 namespace wm {
 class ScopedCaptureClient;
 }
 
 namespace ash {
 class AlwaysOnTopController;
 class AnimatingWallpaperWidgetController;
 class AshTouchExplorationManager;
 class AshWindowTreeHost;
 class BootSplashScreen;
-class DockedWindowLayoutManager;
 enum class LoginStatus;
 class PanelLayoutManager;
 class ShelfLayoutManager;
 class StackingController;
 class StatusAreaWidget;
 class SystemModalContainerLayoutManager;
 class SystemTray;
 class SystemWallpaperController;
 class TouchHudDebug;
 class TouchHudProjection;
@@ skipping 90 matching lines @@
 
   // Set touch HUDs for this root window controller. The root window controller
   // will not own the HUDs; their lifetimes are managed by themselves. Whenever
   // the widget showing a HUD is being destroyed (e.g. because of detaching a
   // display), the HUD deletes itself.
   void set_touch_hud_debug(TouchHudDebug* hud) { touch_hud_debug_ = hud; }
   void set_touch_hud_projection(TouchHudProjection* hud) {
     touch_hud_projection_ = hud;
   }
 
-  DockedWindowLayoutManager* docked_window_layout_manager() {
-    return docked_window_layout_manager_;
-  }
-
   PanelLayoutManager* panel_layout_manager() { return panel_layout_manager_; }
 
   wm::RootWindowLayoutManager* root_window_layout_manager() {
     return root_window_layout_manager_;
   }
 
   // Access the shelf layout manager associated with this root
   // window controller, NULL if no such shelf exists.
   ShelfLayoutManager* GetShelfLayoutManager();
 
@@ skipping 151 matching lines @@
   // Overridden from ShellObserver.
   void OnLoginStateChanged(LoginStatus status) override;
   void OnTouchHudProjectionToggled(bool enabled) override;
 
   std::unique_ptr<AshWindowTreeHost> ash_host_;
   std::unique_ptr<aura::WindowTreeHost> mus_window_tree_host_;
   // This comes from |ash_host_| or |mus_window_tree_host_|.
   aura::WindowTreeHost* window_tree_host_;
 
   // LayoutManagers are owned by the window they are installed on.
-  DockedWindowLayoutManager* docked_window_layout_manager_ = nullptr;
   PanelLayoutManager* panel_layout_manager_ = nullptr;
   wm::RootWindowLayoutManager* root_window_layout_manager_ = nullptr;
 
   std::unique_ptr<WallpaperWidgetController> wallpaper_widget_controller_;
   std::unique_ptr<AnimatingWallpaperWidgetController>
       animating_wallpaper_widget_controller_;
   std::unique_ptr<WorkspaceController> workspace_controller_;
 
   std::unique_ptr<AlwaysOnTopController> always_on_top_controller_;
 
@@ skipping 33 matching lines @@
 
 // On classic ash, returns the RootWindowController for the given |root_window|.
 // On mus ash, returns the RootWindowController for the primary display.
 // See RootWindowController class comment above.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_