Remove implicit conversions from scoped_refptr to T* in content/renderer/media/webrtc*

content/renderer/media/webrtc_local_audio_renderer.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 "content/renderer/media/webrtc_local_audio_renderer.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
@@ skipping 135 matching lines @@
 
   {
     base::AutoLock auto_lock(thread_lock_);
     playing_ = false;
     loopback_fifo_.reset();
   }
 
   // Stop the output audio stream, i.e, stop asking for data to render.
   // It is safer to call Stop() on the |sink_| to clean up the resources even
   // when the |sink_| is never started.
-  if (sink_) {
+  if (sink_.get()) {
     sink_->Stop();
     sink_ = NULL;
   }
 
   if (!sink_started_) {
     UMA_HISTOGRAM_ENUMERATION("Media.LocalRendererSinkStates",
                               kSinkNeverStarted, kSinkStatesMax);
   }
   sink_started_ = false;
 
@@ skipping 142 matching lines @@
     // the FIFO overflows.
     const int blocks_of_buffers =
         10 * params.frames_per_buffer() / sink_params_.frames_per_buffer() + 1;
     media::AudioBlockFifo* new_fifo = new media::AudioBlockFifo(
         params.channels(), sink_params_.frames_per_buffer(), blocks_of_buffers);
 
     base::AutoLock auto_lock(thread_lock_);
     loopback_fifo_.reset(new_fifo);
   }
 
-  if (!sink_)
+  if (!sink_.get())
     return;  // WebRtcLocalAudioRenderer has not yet been started.
 
   // Stop |sink_| and re-create a new one to be initialized with different audio
   // parameters.  Then, invoke MaybeStartSink() to restart everything again.
   if (sink_started_) {
     sink_->Stop();
     sink_started_ = false;
   }
 
   sink_ = AudioDeviceFactory::NewOutputDevice(source_render_view_id_,
                                               source_render_frame_id_);
   MaybeStartSink();
 }
 
 }  // namespace content