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

ash/wm/workspace/workspace_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/wm/workspace/workspace_layout_manager.h"
 
 #include <algorithm>
 
 #include "ash/keyboard/keyboard_observer_register.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ skipping 69 matching lines @@
   wm::WindowState* window_state = wm::GetWindowState(child);
   wm::WMEvent event(wm::WM_EVENT_ADDED_TO_WORKSPACE);
   window_state->OnWMEvent(&event);
   windows_.insert(child);
   child->AddObserver(this);
   window_state->AddObserver(this);
   UpdateShelfVisibility();
   UpdateFullscreenState();
 
   backdrop_controller_->OnWindowAddedToLayout(child);
-  WindowPositioner::RearrangeVisibleWindowOnShow(WmWindow::Get(child));
+  WindowPositioner::RearrangeVisibleWindowOnShow(child);
   if (Shell::Get()->screen_pinning_controller()->IsPinned())
     wm::GetWindowState(child)->DisableAlwaysOnTop(nullptr);
 }
 
 void WorkspaceLayoutManager::OnWillRemoveWindowFromLayout(aura::Window* child) {
   windows_.erase(child);
   child->RemoveObserver(this);
   wm::GetWindowState(child)->RemoveObserver(this);
 
   if (child->layer()->GetTargetVisibility())
-    WindowPositioner::RearrangeVisibleWindowOnHideOrRemove(
-        WmWindow::Get(child));
+    WindowPositioner::RearrangeVisibleWindowOnHideOrRemove(child);
 }
 
 void WorkspaceLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
   UpdateShelfVisibility();
   UpdateFullscreenState();
   backdrop_controller_->OnWindowRemovedFromLayout(child);
 }
 
 void WorkspaceLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
                                                             bool visible) {
   wm::WindowState* window_state = wm::GetWindowState(child);
   // Attempting to show a minimized window. Unminimize it.
   if (visible && window_state->IsMinimized())
     window_state->Unminimize();
 
   if (child->layer()->GetTargetVisibility())
-    WindowPositioner::RearrangeVisibleWindowOnShow(WmWindow::Get(child));
+    WindowPositioner::RearrangeVisibleWindowOnShow(child);
   else
-    WindowPositioner::RearrangeVisibleWindowOnHideOrRemove(
-        WmWindow::Get(child));
+    WindowPositioner::RearrangeVisibleWindowOnHideOrRemove(child);
   UpdateFullscreenState();
   UpdateShelfVisibility();
   backdrop_controller_->OnChildWindowVisibilityChanged(child, visible);
 }
 
 void WorkspaceLayoutManager::SetChildBounds(aura::Window* child,
                                             const gfx::Rect& requested_bounds) {
   wm::SetBoundsEvent event(wm::WM_EVENT_SET_BOUNDS, requested_bounds);
   wm::GetWindowState(child)->OnWMEvent(&event);
   UpdateShelfVisibility();
@@ skipping 268 matching lines @@
   for (aura::Window* window : windows) {
     wm::WindowState* window_state = wm::GetWindowState(window);
     if (window_on_top)
       window_state->DisableAlwaysOnTop(window_on_top);
     else
       window_state->RestoreAlwaysOnTop();
   }
 }
 
 }  // namespace ash