Converts mash to use Shell

ash/display/window_tree_host_manager.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/display/window_tree_host_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 #include <memory>
@@ skipping 338 matching lines @@
   AshWindowTreeHost* host = GetAshWindowTreeHostForDisplayId(id);
   return host ? GetWindow(host) : nullptr;
 }
 
 AshWindowTreeHost* WindowTreeHostManager::GetAshWindowTreeHostForDisplayId(
     int64_t display_id) {
   const auto host = window_tree_hosts_.find(display_id);
   return host == window_tree_hosts_.end() ? nullptr : host->second;
 }
 
-void WindowTreeHostManager::CloseChildWindows() {
-  for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
-       it != window_tree_hosts_.end(); ++it) {
-    aura::Window* root_window = GetWindow(it->second);
-    RootWindowController* controller = GetRootWindowController(root_window);
-    if (controller) {
-      controller->CloseChildWindows();
-    } else {
-      while (!root_window->children().empty()) {
-        aura::Window* child = root_window->children()[0];
-        delete child;
-      }
-    }
-  }
-}
-
 aura::Window::Windows WindowTreeHostManager::GetAllRootWindows() {
   aura::Window::Windows windows;
   for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
        it != window_tree_hosts_.end(); ++it) {
     DCHECK(it->second);
     if (GetRootWindowController(GetWindow(it->second)))
       windows.push_back(GetWindow(it->second));
   }
   return windows;
 }
@@ skipping 501 matching lines @@
 
   window_tree_hosts_[display.id()] = ash_host;
   SetDisplayPropertiesOnHost(ash_host, display);
 
   if (switches::ConstrainPointerToRoot())
     ash_host->ConfineCursorToRootWindow();
   return ash_host;
 }
 
 }  // namespace ash