Convert //media/audio from scoped_ptr to std::unique_ptr

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index 8845585f6a468ae781e0f8fa1cb837bccd91be74..47ca23d18f680951a30e2e9563e9dffc70f102c6 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -375,7 +375,7 @@ int AudioManagerBase::GetUserBufferSize() {
   return 0;
 }
 
-scoped_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
+std::unique_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return audio_log_factory_->CreateAudioLog(component);
 }