convert //gpu to std::unique_ptr

blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.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 BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_GPU_MEMORY_BUFFER_MANAGER_H_
 #define BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_GPU_MEMORY_BUFFER_MANAGER_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
 
 namespace blimp {
 namespace client {
 
 class BlimpGpuMemoryBufferManager : public gpu::GpuMemoryBufferManager {
  public:
   BlimpGpuMemoryBufferManager();
   ~BlimpGpuMemoryBufferManager() override;
@@ skipping 14 matching lines @@
                                const gpu::SyncToken& sync_token) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BlimpGpuMemoryBufferManager);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_GPU_MEMORY_BUFFER_MANAGER_H_