[mus+ash] Removes WmWindow from ash/wm/mru_window_tracker and overview mode

chrome/browser/chromeos/login/users/wallpaper/wallpaper_window_state_manager.cc

 // Copyright 2017 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 "chrome/browser/chromeos/login/users/wallpaper/wallpaper_window_state_manager.h"
 
 #include "ash/shell.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
@@ skipping 48 matching lines @@
 void WallpaperWindowStateManager::BuildWindowListAndMinimizeInactiveForUser(
     const std::string& user_id_hash,
     aura::Window* active_window) {
   if (user_id_hash_window_list_map_.find(user_id_hash) ==
       user_id_hash_window_list_map_.end()) {
     user_id_hash_window_list_map_[user_id_hash] = std::set<aura::Window*>();
   }
   std::set<aura::Window*>* results =
       &user_id_hash_window_list_map_[user_id_hash];
 
-  std::vector<aura::Window*> windows = ash::WmWindow::ToAuraWindows(
-      ash::Shell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal());
+  aura::Window::Windows windows =
+      ash::Shell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal();
 
-  for (std::vector<aura::Window*>::iterator iter = windows.begin();
+  for (aura::Window::Windows::iterator iter = windows.begin();
        iter != windows.end(); ++iter) {
     // Ignore active window and minimized windows.
     if (*iter == active_window || ash::wm::GetWindowState(*iter)->IsMinimized())
       continue;
 
     if (!(*iter)->HasObserver(this))
       (*iter)->AddObserver(this);
 
     results->insert(*iter);
     ash::wm::GetWindowState(*iter)->Minimize();
@@ skipping 46 matching lines @@
   // If user interacted with the |window| while wallpaper picker is opening,
   // removes the |window| from observed list.
   for (auto iter = user_id_hash_window_list_map_.begin();
        iter != user_id_hash_window_list_map_.end(); ++iter) {
     iter->second.erase(window);
   }
   window->RemoveObserver(this);
 }
 
 }  // namespace chromeos