Revert of Replace scoped_ptr with unique_ptr in webrtc/common_audio/

webrtc/common_audio/audio_converter_unittest.cc

Index: webrtc/common_audio/audio_converter_unittest.cc
diff --git a/webrtc/common_audio/audio_converter_unittest.cc b/webrtc/common_audio/audio_converter_unittest.cc
index f86e37b26fad8239c501d144ef102175dd233214..dace0bdccf59b3e612bad16d09aca2fed964192c 100644
--- a/webrtc/common_audio/audio_converter_unittest.cc
+++ b/webrtc/common_audio/audio_converter_unittest.cc
@@ -10,19 +10,19 @@
 
 #include <cmath>
 #include <algorithm>
-#include <memory>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/arraysize.h"
 #include "webrtc/base/format_macros.h"
+#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/common_audio/audio_converter.h"
 #include "webrtc/common_audio/channel_buffer.h"
 #include "webrtc/common_audio/resampler/push_sinc_resampler.h"
 
 namespace webrtc {
 
-typedef std::unique_ptr<ChannelBuffer<float>> ScopedBuffer;
+typedef rtc::scoped_ptr<ChannelBuffer<float>> ScopedBuffer;
 
 // Sets the signal value to increase by |data| with every sample.
 ScopedBuffer CreateBuffer(const std::vector<float>& data, size_t frames) {
@@ -132,7 +132,7 @@
   printf("(%" PRIuS ", %d Hz) -> (%" PRIuS ", %d Hz) ",
          src_channels, src_sample_rate_hz, dst_channels, dst_sample_rate_hz);
 
-  std::unique_ptr<AudioConverter> converter = AudioConverter::Create(
+  rtc::scoped_ptr<AudioConverter> converter = AudioConverter::Create(
       src_channels, src_frames, dst_channels, dst_frames);
   converter->Convert(src_buffer->channels(), src_buffer->size(),
                      dst_buffer->channels(), dst_buffer->size());