convert //gpu to std::unique_ptr

content/common/gpu/media/vt_video_encode_accelerator_mac.cc

 // 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.
 
 #include "content/common/gpu/media/vt_video_encode_accelerator_mac.h"
 
+#include <memory>
+
 #include "base/thread_task_runner_handle.h"
 #include "media/base/mac/coremedia_glue.h"
 #include "media/base/mac/corevideo_glue.h"
 #include "media/base/mac/video_frame_mac.h"
 
 namespace content {
 
 namespace {
 
 // TODO(emircan): Check if we can find the actual system capabilities via
@@ skipping 526 matching lines @@
          (encoder_thread_.IsRunning() &&
           encoder_thread_task_runner_->BelongsToCurrentThread()));
 
   if (compression_session_) {
     videotoolbox_glue_->VTCompressionSessionInvalidate(compression_session_);
     compression_session_.reset();
   }
 }
 
 } // namespace content