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

ash/content/screen_orientation_delegate_chromeos.cc

 // Copyright 2015 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/content/screen_orientation_delegate_chromeos.h"
 
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/shell.h"
-#include "ash/wm_window.h"
 #include "content/public/browser/web_contents.h"
 
 namespace ash {
 
 ScreenOrientationDelegateChromeos::ScreenOrientationDelegateChromeos() {
   content::WebContents::SetScreenOrientationDelegate(this);
 }
 
 ScreenOrientationDelegateChromeos::~ScreenOrientationDelegateChromeos() {
   content::WebContents::SetScreenOrientationDelegate(nullptr);
 }
 
 bool ScreenOrientationDelegateChromeos::FullScreenRequired(
     content::WebContents* web_contents) {
   return true;
 }
 
 void ScreenOrientationDelegateChromeos::Lock(
     content::WebContents* web_contents,
     blink::WebScreenOrientationLockType lock_orientation) {
   Shell::Get()->screen_orientation_controller()->LockOrientationForWindow(
-      WmWindow::Get(web_contents->GetNativeView()), lock_orientation,
+      web_contents->GetNativeView(), lock_orientation,
       ScreenOrientationController::LockCompletionBehavior::None);
 }
 
 bool ScreenOrientationDelegateChromeos::ScreenOrientationProviderSupported() {
   return Shell::Get()
       ->screen_orientation_controller()
       ->ScreenOrientationProviderSupported();
 }
 
 void ScreenOrientationDelegateChromeos::Unlock(
     content::WebContents* web_contents) {
   Shell::Get()->screen_orientation_controller()->UnlockOrientationForWindow(
-      WmWindow::Get(web_contents->GetNativeView()));
+      web_contents->GetNativeView());
 }
 
 }  // namespace ash