chromeos: Remove some WmWindow usage from ash/system

ash/system/tray/system_tray.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/system/tray/system_tray.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
@@ skipping 32 matching lines @@
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_container.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/tray_caps_lock.h"
 #include "ash/system/tray_tracing.h"
 #include "ash/system/update/tray_update.h"
 #include "ash/system/user/tray_user.h"
 #include "ash/system/web_notification/web_notification_tray.h"
 #include "ash/wm/container_finder.h"
 #include "ash/wm/widget_finder.h"
-#include "ash/wm_window.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/timer/timer.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/events/event_constants.h"
@@ skipping 528 matching lines @@
 
 base::string16 SystemTray::GetAccessibleNameForBubble() {
   return GetAccessibleNameForTray();
 }
 
 void SystemTray::OnBeforeBubbleWidgetInit(
     views::Widget* anchor_widget,
     views::Widget* bubble_widget,
     views::Widget::InitParams* params) const {
   // Place the bubble in the same root window as |anchor_widget|.
-  WmWindow::Get(anchor_widget->GetNativeWindow())
-      ->GetRootWindowController()
+  RootWindowController::ForWindow(anchor_widget->GetNativeWindow())
       ->ConfigureWidgetInitParamsForContainer(
           bubble_widget, kShellWindowId_SettingBubbleContainer, params);
 }
 
 void SystemTray::HideBubble(const TrayBubbleView* bubble_view) {
   HideBubbleWithView(bubble_view);
 }
 
 TrayCast* SystemTray::GetTrayCastForTesting() const {
   return tray_cast_;
@@ skipping 108 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash