mash: Fold ShelfItemDelegateManager into ShelfModel

ash/shell/window_watcher.cc

 // 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.
 
 #include "ash/shell/window_watcher.h"
 
 #include <utility>
 
-#include "ash/common/shelf/shelf_item_delegate_manager.h"
 #include "ash/common/shelf/shelf_model.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm_shell.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_util.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell/window_watcher_shelf_item_delegate.h"
 #include "ash/wm/window_util.h"
@@ skipping 87 matching lines @@
 
   SkBitmap icon_bitmap;
   icon_bitmap.allocN32Pixels(16, 16);
   icon_bitmap.eraseARGB(255, image_count == 0 ? 255 : 0,
                         image_count == 1 ? 255 : 0, image_count == 2 ? 255 : 0);
   image_count = (image_count + 1) % 3;
   item.image = gfx::ImageSkia(gfx::ImageSkiaRep(icon_bitmap, 1.0f));
 
   model->Add(item);
 
-  ShelfItemDelegateManager* manager =
-      Shell::GetInstance()->shelf_item_delegate_manager();
   std::unique_ptr<ShelfItemDelegate> delegate(
       new WindowWatcherShelfItemDelegate(id, this));
-  manager->SetShelfItemDelegate(id, std::move(delegate));
+  model->SetShelfItemDelegate(id, std::move(delegate));
   SetShelfIDForWindow(id, new_window);
 }
 
 void WindowWatcher::OnWillRemoveWindow(aura::Window* window) {
   for (IDToWindow::iterator i = id_to_window_.begin(); i != id_to_window_.end();
        ++i) {
     if (i->second == window) {
       ShelfModel* model = WmShell::Get()->shelf_model();
       int index = model->ItemIndexByID(i->first);
       DCHECK_NE(-1, index);
@@ skipping 14 matching lines @@
 void WindowWatcher::OnDisplayRemoved(const display::Display& old_display) {
   // All windows in the display has already been removed, so no need to
   // remove observers.
 }
 
 void WindowWatcher::OnDisplayMetricsChanged(const display::Display&, uint32_t) {
 }
 
 }  // namespace shell
 }  // namespace ash