Update the layout mode first when exiting tablet mode

components/exo/wm_helper_ash.cc

 // Copyright 2016 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 "components/exo/wm_helper_ash.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
@@ skipping 118 matching lines @@
 
 void WMHelperAsh::OnAccessibilityModeChanged(
     ash::AccessibilityNotificationVisibility notify) {
   NotifyAccessibilityModeChanged();
 }
 
 void WMHelperAsh::OnMaximizeModeStarted() {
   NotifyMaximizeModeStarted();
 }
 
+void WMHelperAsh::OnMaximizeModeEnding() {
+  NotifyMaximizeModeEnding();
+}
+
 void WMHelperAsh::OnMaximizeModeEnded() {
   NotifyMaximizeModeEnded();
 }
 
 void WMHelperAsh::OnKeyboardDeviceConfigurationChanged() {
   NotifyKeyboardDeviceConfigurationChanged();
 }
 
 }  // namespace exo