Replace the remaining scoped_ptr with unique_ptr in webrtc/modules/

webrtc/modules/video_coding/packet_buffer_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <cstring>
 #include <limits>
+#include <memory>
 
 #include "webrtc/modules/video_coding/frame_object.h"
 #include "webrtc/modules/video_coding/packet_buffer.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/random.h"
 
 namespace webrtc {
 namespace video_coding {
 
@@ skipping 700 matching lines @@
 
   ASSERT_EQ(4UL, frames_from_callback_.size());
   CheckReferences(pid);
   CheckReferences(pid + 1, pid);
   CheckReferences(pid + 2, pid + 1);
   CheckReferences(pid + 3, pid + 2);
 }
 
 }  // namespace video_coding
 }  // namespace webrtc