Replace scoped_ptr with unique_ptr in webrtc/media/

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1728503002

Cr-Commit-Position: refs/heads/master@{#11779}
diff --git a/webrtc/media/engine/webrtcvoiceengine.cc b/webrtc/media/engine/webrtcvoiceengine.cc
index 3709e80..28c5079 100644
--- a/webrtc/media/engine/webrtcvoiceengine.cc
+++ b/webrtc/media/engine/webrtcvoiceengine.cc
@@ -1310,9 +1310,9 @@
     return config_.voe_channel_id;
   }
 
-  void SetRawAudioSink(rtc::scoped_ptr<webrtc::AudioSinkInterface> sink) {
+  void SetRawAudioSink(std::unique_ptr<webrtc::AudioSinkInterface> sink) {
     RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
-    stream_->SetSink(rtc::ScopedToUnique(std::move(sink)));
+    stream_->SetSink(std::move(sink));
   }
 
  private:
@@ -2236,7 +2236,7 @@
     default_recv_ssrc_ = ssrc;
     SetOutputVolume(default_recv_ssrc_, default_recv_volume_);
     if (default_sink_) {
-      rtc::scoped_ptr<webrtc::AudioSinkInterface> proxy_sink(
+      std::unique_ptr<webrtc::AudioSinkInterface> proxy_sink(
           new ProxySink(default_sink_.get()));
       SetRawAudioSink(default_recv_ssrc_, std::move(proxy_sink));
     }
@@ -2466,13 +2466,13 @@
 
 void WebRtcVoiceMediaChannel::SetRawAudioSink(
     uint32_t ssrc,
-    rtc::scoped_ptr<webrtc::AudioSinkInterface> sink) {
+    std::unique_ptr<webrtc::AudioSinkInterface> sink) {
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   LOG(LS_VERBOSE) << "WebRtcVoiceMediaChannel::SetRawAudioSink: ssrc:" << ssrc
                   << " " << (sink ? "(ptr)" : "NULL");
   if (ssrc == 0) {
     if (default_recv_ssrc_ != -1) {
-      rtc::scoped_ptr<webrtc::AudioSinkInterface> proxy_sink(
+      std::unique_ptr<webrtc::AudioSinkInterface> proxy_sink(
           sink ? new ProxySink(sink.get()) : nullptr);
       SetRawAudioSink(default_recv_ssrc_, std::move(proxy_sink));
     }