Replace scoped_ptr with unique_ptr in webrtc/modules/video_coding/

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1721353002

Cr-Commit-Position: refs/heads/master@{#11814}
diff --git a/webrtc/modules/video_coding/video_receiver_unittest.cc b/webrtc/modules/video_coding/video_receiver_unittest.cc
index 693fdc6..05656a5 100644
--- a/webrtc/modules/video_coding/video_receiver_unittest.cc
+++ b/webrtc/modules/video_coding/video_receiver_unittest.cc
@@ -8,10 +8,10 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
-#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/video_coding/include/mock/mock_video_codec_interface.h"
 #include "webrtc/modules/video_coding/include/mock/mock_vcm_callbacks.h"
 #include "webrtc/modules/video_coding/include/video_coding.h"
@@ -75,7 +75,7 @@
   NiceMock<MockVideoDecoder> decoder_;
   NiceMock<MockPacketRequestCallback> packet_request_callback_;
 
-  rtc::scoped_ptr<VideoReceiver> receiver_;
+  std::unique_ptr<VideoReceiver> receiver_;
 };
 
 TEST_F(TestVideoReceiver, PaddingOnlyFrames) {