Purge the App Launcher code from Mac

ui/app_list/cocoa/apps_search_results_model_bridge.h

-// Copyright 2013 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 UI_APP_LIST_COCOA_APPS_SEARCH_RESULTS_MODEL_BRIDGE_H_
-#define UI_APP_LIST_COCOA_APPS_SEARCH_RESULTS_MODEL_BRIDGE_H_
-
-#include <stddef.h>
-
-#include "base/mac/scoped_nsobject.h"
-#include "base/macros.h"
-#include "base/memory/scoped_vector.h"
-#include "ui/base/models/list_model_observer.h"
-
-@class NSMenu;
-@class AppsSearchResultsController;
-
-namespace app_list {
-
-// Bridge observing the ListModel representing search results in the app list,
-// and updating the NSTableView where they are displayed.
-class AppsSearchResultsModelBridge : public ui::ListModelObserver {
- public:
-  explicit AppsSearchResultsModelBridge(
-      AppsSearchResultsController* results_controller);
-  ~AppsSearchResultsModelBridge() override;
-
-  // Returns the context menu for the item at |index| in the search results
-  // model. A menu will be generated if it hasn't been previously requested.
-  NSMenu* MenuForItem(size_t index);
-
- private:
-  // Lightweight observer to react to icon updates on individual results.
-  class ItemObserver;
-
-  void UpdateItemObservers();
-  void ReloadDataForItems(size_t start, size_t count) const;
-
-  // Overridden from ui::ListModelObserver:
-  void ListItemsAdded(size_t start, size_t count) override;
-  void ListItemsRemoved(size_t start, size_t count) override;
-  void ListItemMoved(size_t index, size_t target_index) override;
-  void ListItemsChanged(size_t start, size_t count) override;
-
-  AppsSearchResultsController* parent_;  // Weak. Owns us.
-  ScopedVector<ItemObserver> item_observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppsSearchResultsModelBridge);
-};
-
-}  // namespace app_list
-
-#endif  // UI_APP_LIST_COCOA_APPS_SEARCH_RESULTS_MODEL_BRIDGE_H_