convert //gpu to std::unique_ptr

gpu/command_buffer/service/gpu_state_tracer.h

 // Copyright 2013 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 GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace gfx {
 class Size;
 }
 
 namespace gpu {
 namespace gles2 {
 
 struct ContextState;
 
 // Saves GPU state such as framebuffer contents while tracing.
 class GPUStateTracer {
  public:
-  static scoped_ptr<GPUStateTracer> Create(const ContextState* state);
+  static std::unique_ptr<GPUStateTracer> Create(const ContextState* state);
   ~GPUStateTracer();
 
   // Take a state snapshot with a screenshot of the currently bound framebuffer.
   void TakeSnapshotWithCurrentFramebuffer(const gfx::Size& size);
 
  private:
   explicit GPUStateTracer(const ContextState* state);
 
   const ContextState* state_;
   DISALLOW_COPY_AND_ASSIGN(GPUStateTracer);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_STATE_TRACER_H_