Ozone DRM: Destroy MusThreadProxy last.

ui/ozone/platform/drm/host/drm_display_host_manager.cc

 // Copyright 2014 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 "ui/ozone/platform/drm/host/drm_display_host_manager.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 #include <xf86drm.h>
 
@@ skipping 137 matching lines @@
         CreateDisplaySnapshotParams(
             display_info.get(), primary_drm_device_handle_->fd(),
             primary_drm_device_handle_->sys_path(), 0, gfx::Point()),
         true /* is_dummy */));
   }
 }
 
 DrmDisplayHostManager::~DrmDisplayHostManager() {
   device_manager_->RemoveObserver(this);
   proxy_->UnRegisterHandlerForDrmDisplayHostManager();
+  proxy_->RemoveGpuThreadObserver(this);
 }
 
 DrmDisplayHost* DrmDisplayHostManager::GetDisplay(int64_t display_id) {
   auto it = std::find_if(displays_.begin(), displays_.end(),
                          FindDrmDisplayHostById(display_id));
   if (it == displays_.end())
     return nullptr;
 
   return it->get();
 }
@@ skipping 297 matching lines @@
 
   callback.Run(snapshots);
 }
 
 void DrmDisplayHostManager::NotifyDisplayDelegate() const {
   if (delegate_)
     delegate_->OnConfigurationChanged();
 }
 
 }  // namespace ui