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

ash/wm/window_cycle_controller.cc

Index: ash/wm/window_cycle_controller.cc
diff --git a/ash/wm/window_cycle_controller.cc b/ash/wm/window_cycle_controller.cc
index dae260659c551aa4c6af3a82443164c0735074fb..132d447ec4d18f4a93e57252c16239b2b6b41265 100644
--- a/ash/wm/window_cycle_controller.cc
+++ b/ash/wm/window_cycle_controller.cc
@@ -55,8 +55,8 @@ void WindowCycleController::HandleCycleWindow(Direction direction) {
 }
 
 void WindowCycleController::StartCycling() {
-  WindowCycleList::WindowList window_list = WmWindow::ToAuraWindows(
-      Shell::Get()->mru_window_tracker()->BuildMruWindowList());
+  WindowCycleList::WindowList window_list =
+      Shell::Get()->mru_window_tracker()->BuildMruWindowList();
   // Exclude windows:
   // - non user positionable windows, such as extension popups.
   // - windows being dragged
@@ -110,8 +110,7 @@ void WindowCycleController::StopCycling() {
   window_cycle_list_.reset();
 
   aura::Window* active_window_after_window_cycle =
-      GetActiveWindow(WmWindow::ToAuraWindows(
-          Shell::Get()->mru_window_tracker()->BuildMruWindowList()));
+      GetActiveWindow(Shell::Get()->mru_window_tracker()->BuildMruWindowList());
 
   // Remove our key event filter.
   event_filter_.reset();