Remove WmLookup.

ash/common/system/web_notification/web_notification_tray.cc

Index: ash/common/system/web_notification/web_notification_tray.cc
diff --git a/ash/common/system/web_notification/web_notification_tray.cc b/ash/common/system/web_notification/web_notification_tray.cc
index 8385666745b691fc7b43b7c8f83103accbe235b2..59bded4c2c3d09fe6d824dfa65cd96a1c41831f8 100644
--- a/ash/common/system/web_notification/web_notification_tray.cc
+++ b/ash/common/system/web_notification/web_notification_tray.cc
@@ -16,7 +16,6 @@
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/system/web_notification/ash_popup_alignment_delegate.h"
-#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ -501,8 +500,7 @@ void WebNotificationTray::OnBeforeBubbleWidgetInit(
     views::Widget* bubble_widget,
     views::Widget::InitParams* params) const {
   // Place the bubble in the same root window as |anchor_widget|.
-  WmLookup::Get()
-      ->GetWindowForWidget(anchor_widget)
+  WmWindow::Get(anchor_widget->GetNativeWindow())
       ->GetRootWindowController()
       ->ConfigureWidgetInitParamsForContainer(
           bubble_widget, kShellWindowId_SettingBubbleContainer, params);