Replace scoped_ptr with unique_ptr in webrtc/modules/audio_processing/

webrtc/modules/audio_processing/agc/agc.h

Index: webrtc/modules/audio_processing/agc/agc.h
diff --git a/webrtc/modules/audio_processing/agc/agc.h b/webrtc/modules/audio_processing/agc/agc.h
index 08c287f82057c613e3c3b27b9871b9255f35043b..9b6b8556ab95a1a001b7711a834897ed2414dcf9 100644
--- a/webrtc/modules/audio_processing/agc/agc.h
+++ b/webrtc/modules/audio_processing/agc/agc.h
@@ -11,7 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_AGC_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_AGC_H_
 
-#include "webrtc/base/scoped_ptr.h"
+#include <memory>
+
 #include "webrtc/modules/audio_processing/vad/voice_activity_detector.h"
 #include "webrtc/typedefs.h"
 
@@ -48,8 +49,8 @@ class Agc {
  private:
   double target_level_loudness_;
   int target_level_dbfs_;
-  rtc::scoped_ptr<Histogram> histogram_;
-  rtc::scoped_ptr<Histogram> inactive_histogram_;
+  std::unique_ptr<Histogram> histogram_;
+  std::unique_ptr<Histogram> inactive_histogram_;
   VoiceActivityDetector vad_;
 };