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

remoting/codec/audio_encoder_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_encoder_opus.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "media/base/audio_bus.h"
@@ skipping 124 matching lines @@
 }
 
 scoped_ptr<AudioPacket> AudioEncoderOpus::Encode(
     scoped_ptr<AudioPacket> packet) {
   DCHECK_EQ(AudioPacket::ENCODING_RAW, packet->encoding());
   DCHECK_EQ(1, packet->data_size());
   DCHECK_EQ(kBytesPerSample, packet->bytes_per_sample());
 
   if (!ResetForPacket(packet.get())) {
     LOG(ERROR) << "Encoder initialization failed";
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
   }
 
   int samples_in_packet = packet->data(0).size() / kBytesPerSample / channels_;
   const int16* next_sample =
       reinterpret_cast<const int16*>(packet->data(0).data());
 
   // Create a new packet of encoded data.
   scoped_ptr<AudioPacket> encoded_packet(new AudioPacket());
   encoded_packet->set_encoding(AudioPacket::ENCODING_OPUS);
   encoded_packet->set_sampling_rate(kOpusSamplingRate);
@@ skipping 37 matching lines @@
     std::string* data = encoded_packet->add_data();
     data->resize(kFrameSamples * kBytesPerSample * channels_);
 
     // Encode.
     unsigned char* buffer =
         reinterpret_cast<unsigned char*>(string_as_array(data));
     int result = opus_encode(encoder_, pcm_buffer, kFrameSamples,
                              buffer, data->length());
     if (result < 0) {
       LOG(ERROR) << "opus_encode() failed with error code: " << result;
-      return scoped_ptr<AudioPacket>();
+      return nullptr;
     }
 
     DCHECK_LE(result, static_cast<int>(data->length()));
     data->resize(result);
 
     // Cleanup leftover buffer.
     if (samples_consumed >= leftover_samples_) {
       samples_consumed -= leftover_samples_;
       leftover_samples_ = 0;
       next_sample += samples_consumed * channels_;
       samples_in_packet -= samples_consumed;
     } else {
       leftover_samples_ -= samples_consumed;
       memmove(leftover_buffer_.get(),
               leftover_buffer_.get() + samples_consumed * channels_,
               leftover_samples_ * channels_ * kBytesPerSample);
     }
   }
 
   // Store the leftover samples.
   if (samples_in_packet > 0) {
     DCHECK_LE(leftover_samples_ + samples_in_packet, leftover_buffer_size_);
     memmove(leftover_buffer_.get() + leftover_samples_ * channels_,
             next_sample, samples_in_packet * kBytesPerSample * channels_);
     leftover_samples_ += samples_in_packet;
   }
 
   // Return NULL if there's nothing in the packet.
   if (encoded_packet->data_size() == 0)
-    return scoped_ptr<AudioPacket>();
+    return nullptr;
 
   return encoded_packet.Pass();
 }
 
 }  // namespace remoting