Remove "solo window" feature

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 "ash/ash_export.h"
@@ skipping 26 matching lines @@
 class ScopedCaptureClient;
 }
 }
 
 namespace keyboard {
 class KeyboardController;
 }
 
 namespace ash {
 class ShelfWidget;
-class SoloWindowTracker;
 class StackingController;
 class SystemTray;
 class ToplevelWindowEventHandler;
 
 namespace internal {
 
 class AlwaysOnTopController;
 class AnimatingDesktopController;
 class DesktopBackgroundWidgetController;
 class DockedWindowLayoutManager;
@@ skipping 89 matching lines @@
 
   DesktopBackgroundWidgetController* wallpaper_controller() {
     return wallpaper_controller_.get();
   }
   void SetWallpaperController(DesktopBackgroundWidgetController* controller);
   AnimatingDesktopController* animating_wallpaper_controller() {
     return animating_wallpaper_controller_.get();
   }
   void SetAnimatingWallpaperController(AnimatingDesktopController* controller);
 
-  SoloWindowTracker* solo_window_tracker() {
-    return solo_window_tracker_.get();
-  }
-
   // Access the shelf layout manager associated with this root
   // window controller, NULL if no such shelf exists.
   ShelfLayoutManager* GetShelfLayoutManager();
 
   // Returns the system tray on this root window. Note that
   // calling this on the root window that doesn't have a shelf will
   // lead to a crash.
   SystemTray* GetSystemTray();
 
   // Shows context menu at the |location_in_screen|. This uses
@@ skipping 135 matching lines @@
   scoped_ptr<ToplevelWindowEventHandler> default_container_handler_;
   scoped_ptr<ToplevelWindowEventHandler> always_on_top_container_handler_;
   scoped_ptr<ToplevelWindowEventHandler> modal_container_handler_;
   scoped_ptr<ToplevelWindowEventHandler> lock_modal_container_handler_;
   scoped_ptr<ToplevelWindowEventHandler> panel_container_handler_;
   scoped_ptr<ToplevelWindowEventHandler> docked_container_handler_;
 
   scoped_ptr<DesktopBackgroundWidgetController> wallpaper_controller_;
   scoped_ptr<AnimatingDesktopController> animating_wallpaper_controller_;
   scoped_ptr<views::corewm::ScopedCaptureClient> capture_client_;
-  scoped_ptr<SoloWindowTracker> solo_window_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 
 // Gets the RootWindowController for |root_window|.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace internal
 }  // ash
 
 #endif  //  ASH_ROOT_WINDOW_CONTROLLER_H_