convert //gpu to std::unique_ptr

gpu/command_buffer/service/sampler_manager.h

 // Copyright (c) 2015 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_SAMPLER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_SAMPLER_MANAGER_H_
 
+#include <memory>
 #include <vector>
+
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 
 namespace gles2 {
 
 class SamplerManager;
 
@@ skipping 138 matching lines @@
 
   bool have_context_;
 
   DISALLOW_COPY_AND_ASSIGN(SamplerManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_SAMPLER_MANAGER_H_