Replace scoped_ptr with unique_ptr in webrtc/modules/audio_processing/

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1710483002

Cr-Commit-Position: refs/heads/master@{#11684}
diff --git a/webrtc/modules/audio_processing/noise_suppression_impl.cc b/webrtc/modules/audio_processing/noise_suppression_impl.cc
index dbfe1c4..076f1ba 100644
--- a/webrtc/modules/audio_processing/noise_suppression_impl.cc
+++ b/webrtc/modules/audio_processing/noise_suppression_impl.cc
@@ -56,7 +56,7 @@
   rtc::CritScope cs(crit_);
   channels_ = channels;
   sample_rate_hz_ = sample_rate_hz;
-  std::vector<rtc::scoped_ptr<Suppressor>> new_suppressors;
+  std::vector<std::unique_ptr<Suppressor>> new_suppressors;
   if (enabled_) {
     new_suppressors.resize(channels);
     for (size_t i = 0; i < channels; i++) {