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

ash/shelf/shelf_layout_manager.cc

 // Copyright (c) 2012 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/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
@@ skipping 858 matching lines @@
     show_shelf_region_in_screen.set_height(kMaxAutoHideShowShelfRegionSize);
   else
     show_shelf_region_in_screen.set_width(kMaxAutoHideShowShelfRegionSize);
 
   // TODO: Figure out if we need any special handling when the keyboard is
   // visible.
   return show_shelf_region_in_screen;
 }
 
 bool ShelfLayoutManager::HasVisibleWindow() const {
-  WmWindow* root =
-      WmWindow::Get(shelf_widget_->GetNativeWindow())->GetRootWindow();
-  const std::vector<WmWindow*> windows =
+  aura::Window* root = shelf_widget_->GetNativeWindow()->GetRootWindow();
+  const aura::Window::Windows windows =
       Shell::Get()->mru_window_tracker()->BuildWindowListIgnoreModal();
   // Process the window list and check if there are any visible windows.
   // Ignore app list windows that may be animating to hide after dismissal.
   for (auto* window : windows) {
-    if (window->IsVisible() && !IsAppListWindow(window->aura_window()) &&
+    if (window->IsVisible() && !IsAppListWindow(window) &&
         root->Contains(window)) {
       return true;
     }
   }
   return false;
 }
 
 ShelfAutoHideState ShelfLayoutManager::CalculateAutoHideState(
     ShelfVisibilityState visibility_state) const {
   // Shelf is not available before login.
@@ skipping 259 matching lines @@
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 void ShelfLayoutManager::CancelGestureDrag() {
   gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
   UpdateVisibilityState();
   gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 }  // namespace ash