Unify mustash display closing code paths.

services/ui/ws/display_manager.cc

 // Copyright 2016 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 "services/ui/ws/display_manager.h"
 
 #include "base/memory/ptr_util.h"
 #include "services/ui/display/platform_screen.h"
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_binding.h"
@@ skipping 164 matching lines @@
   ws::Display* display = new ws::Display(window_server_, params);
   display->Init(nullptr);
 
   window_server_->delegate()->UpdateTouchTransforms();
 }
 
 void DisplayManager::OnDisplayRemoved(int64_t id) {
   Display* display = GetDisplayById(id);
   if (display)
     DestroyDisplay(display);
-  // TODO(kylechar): What if the display is still pending?
 }
 
 void DisplayManager::OnDisplayModified(int64_t id, const gfx::Rect& bounds) {
   // TODO(kylechar): Implement.
   NOTREACHED();
 }
 
 }  // namespace ws
 }  // namespace ui