Use std::move() instead of .Pass() in remoting/*

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 217 matching lines @@
     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 nullptr if there's nothing in the packet.
   if (encoded_packet->data_size() == 0)
     return nullptr;
 
-  return encoded_packet.Pass();
+  return encoded_packet;
 }
 
 }  // namespace remoting