Update to current webrtc library

This is from the upstream library commit id
3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium
88.0.4290.1.

webrtc/common_audio/real_fourier.h

@@ -8,13 +8,15 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_COMMON_AUDIO_REAL_FOURIER_H_
-#define WEBRTC_COMMON_AUDIO_REAL_FOURIER_H_
+#ifndef COMMON_AUDIO_REAL_FOURIER_H_
+#define COMMON_AUDIO_REAL_FOURIER_H_
+
+#include <stddef.h>
 
 #include <complex>
+#include <memory>
 
-#include "webrtc/base/scoped_ptr.h"
-#include "webrtc/system_wrappers/include/aligned_malloc.h"
+#include "rtc_base/memory/aligned_malloc.h"
 
 // Uniform interface class for the real DFT and its inverse, for power-of-2
 // input lengths. Also contains helper functions for buffer allocation, taking
@@ -25,17 +27,17 @@ namespace webrtc {
 class RealFourier {
  public:
   // Shorthand typenames for the scopers used by the buffer allocation helpers.
-  typedef rtc::scoped_ptr<float[], AlignedFreeDeleter> fft_real_scoper;
-  typedef rtc::scoped_ptr<std::complex<float>[], AlignedFreeDeleter>
+  typedef std::unique_ptr<float[], AlignedFreeDeleter> fft_real_scoper;
+  typedef std::unique_ptr<std::complex<float>[], AlignedFreeDeleter>
       fft_cplx_scoper;
 
   // The alignment required for all input and output buffers, in bytes.
-  static const int kFftBufferAlignment;
+  static const size_t kFftBufferAlignment;
 
   // Construct a wrapper instance for the given input order, which must be
   // between 1 and kMaxFftOrder, inclusively.
-  static rtc::scoped_ptr<RealFourier> Create(int fft_order);
-  virtual ~RealFourier() {};
+  static std::unique_ptr<RealFourier> Create(int fft_order);
+  virtual ~RealFourier() {}
 
   // Helper to compute the smallest FFT order (a power of 2) which will contain
   // the given input length.
@@ -71,5 +73,4 @@ class RealFourier {
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_COMMON_AUDIO_REAL_FOURIER_H_
-
+#endif  // COMMON_AUDIO_REAL_FOURIER_H_