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

ash/content/screen_orientation_delegate_chromeos.cc

Index: ash/content/screen_orientation_delegate_chromeos.cc
diff --git a/ash/content/screen_orientation_delegate_chromeos.cc b/ash/content/screen_orientation_delegate_chromeos.cc
index 32a42311dbb8f1d41bab1e12a6d943cd98be24bf..11d94ae1012aa2fec3b80e50701c3107ac8523c1 100644
--- a/ash/content/screen_orientation_delegate_chromeos.cc
+++ b/ash/content/screen_orientation_delegate_chromeos.cc
@@ -6,7 +6,6 @@
 
 #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 {
@@ -28,7 +27,7 @@ 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);
 }
 
@@ -41,7 +40,7 @@ bool ScreenOrientationDelegateChromeos::ScreenOrientationProviderSupported() {
 void ScreenOrientationDelegateChromeos::Unlock(
     content::WebContents* web_contents) {
   Shell::Get()->screen_orientation_controller()->UnlockOrientationForWindow(
-      WmWindow::Get(web_contents->GetNativeView()));
+      web_contents->GetNativeView());
 }
 
 }  // namespace ash