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}

webrtc/modules/audio_processing/beamformer/complex_matrix.h

@@ -14,7 +14,6 @@
 #include <complex>
 
 #include "webrtc/base/checks.h"
-#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/audio_processing/beamformer/matrix.h"
 
 namespace webrtc {

webrtc/modules/audio_processing/beamformer/matrix.h

@@ -18,7 +18,6 @@
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/constructormagic.h"
-#include "webrtc/base/scoped_ptr.h"
 
 namespace {
 

webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.h

@@ -15,6 +15,8 @@
 #define _USE_MATH_DEFINES
 
 #include <math.h>
+
+#include <memory>
 #include <vector>
 
 #include "webrtc/common_audio/lapped_transform.h"
@@ -125,7 +127,7 @@ class NonlinearBeamformer
 
   // Deals with the fft transform and blocking.
   size_t chunk_length_;
-  rtc::scoped_ptr<LappedTransform> lapped_transform_;
+  std::unique_ptr<LappedTransform> lapped_transform_;
   float window_[kFftSize];
 
   // Parameters exposed to the user.