Replace scoped_ptr with unique_ptr in webrtc/api/

webrtc/api/dtmfsender_unittest.cc

Index: webrtc/api/dtmfsender_unittest.cc
diff --git a/webrtc/api/dtmfsender_unittest.cc b/webrtc/api/dtmfsender_unittest.cc
index 0a944cb160d7decf513626497d7dff7d88765ccc..e6fa7fc5f05ee3a449338c4caca8170c5e72fada 100644
--- a/webrtc/api/dtmfsender_unittest.cc
+++ b/webrtc/api/dtmfsender_unittest.cc
@@ -10,6 +10,7 @@
 
 #include "webrtc/api/dtmfsender.h"
 
+#include <memory>
 #include <set>
 #include <string>
 #include <vector>
@@ -214,8 +215,8 @@ class DtmfSenderTest : public testing::Test {
   }
 
   rtc::scoped_refptr<AudioTrackInterface> track_;
-  rtc::scoped_ptr<FakeDtmfObserver> observer_;
-  rtc::scoped_ptr<FakeDtmfProvider> provider_;
+  std::unique_ptr<FakeDtmfObserver> observer_;
+  std::unique_ptr<FakeDtmfProvider> provider_;
   rtc::scoped_refptr<DtmfSender> dtmf_;
 };