Singletons changes necessary to run the UI Service inside the browser's process.

services/ui/gpu/gpu_main.h

 // 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.
 
 #ifndef SERVICES_UI_GPU_GPU_MAIN_H_
 #define SERVICES_UI_GPU_GPU_MAIN_H_
 
 #include "base/power_monitor/power_monitor.h"
 #include "base/threading/thread.h"
 #include "gpu/ipc/in_process_command_buffer.h"
@@ skipping 78 matching lines @@
 
   // The main thread for Gpu.
   base::Thread gpu_thread_;
   scoped_refptr<base::SingleThreadTaskRunner> gpu_thread_task_runner_;
 
   // The thread that handles IO events for Gpu.
   base::Thread io_thread_;
 
   scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner_;
 
-  base::PowerMonitor power_monitor_;
+  std::unique_ptr<base::PowerMonitor> power_monitor_;
   mojo::Binding<mojom::GpuMain> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMain);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_GPU_GPU_MAIN_H_