Cleanup usage of scoped_ptr<> in remoting for C++11

remoting/codec/audio_decoder_opus.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/codec/audio_decoder_opus.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/time/time.h"
 #include "remoting/proto/audio.pb.h"
@@ skipping 63 matching lines @@
 
   return decoder_ != NULL;
 }
 
 
 scoped_ptr<AudioPacket> AudioDecoderOpus::Decode(
     scoped_ptr<AudioPacket> packet) {
   if (packet->encoding() != AudioPacket::ENCODING_OPUS) {
     LOG(WARNING) << "Received an audio packet with encoding "
                  << packet->encoding() << " when an OPUS packet was expected.";
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
   }
   if (packet->data_size() > kMaxFramesPerPacket) {
     LOG(WARNING) << "Received an packet with too many frames.";
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
   }
 
   if (!ResetForPacket(packet.get())) {
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
   }
 
   // Create a new packet of decoded data.
   scoped_ptr<AudioPacket> decoded_packet(new AudioPacket());
   decoded_packet->set_encoding(AudioPacket::ENCODING_RAW);
   decoded_packet->set_sampling_rate(kSamplingRate);
   decoded_packet->set_bytes_per_sample(AudioPacket::BYTES_PER_SAMPLE_2);
   decoded_packet->set_channels(packet->channels());
 
   int max_frame_samples = kMaxFrameSizeMs * kSamplingRate /
@@ skipping 11 matching lines @@
     CHECK_LE(buffer_pos + max_frame_bytes,
              static_cast<int>(decoded_data->size()));
     std::string* frame = packet->mutable_data(i);
     unsigned char* frame_data =
         reinterpret_cast<unsigned char*>(string_as_array(frame));
     int result = opus_decode(decoder_, frame_data, frame->size(),
                              pcm_buffer, max_frame_samples, 0);
     if (result < 0) {
       LOG(ERROR) << "Failed decoding Opus frame. Error code: " << result;
       DestroyDecoder();
-      return scoped_ptr<AudioPacket>();
+      return nullptr;
     }
 
     buffer_pos += result * packet->channels() *
         decoded_packet->bytes_per_sample();
   }
 
   if (!buffer_pos) {
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
   }
 
   decoded_data->resize(buffer_pos);
 
   return decoded_packet.Pass();
 }
 
 }  // namespace remoting