Remove implicit conversions from scoped_refptr to T* in media/

media/filters/frame_processor.cc

Index: media/filters/frame_processor.cc
diff --git a/media/filters/frame_processor.cc b/media/filters/frame_processor.cc
index 6d98e8b13abc8d28910b8378242d6a9eab04514a..dae8577e8f6c9f0b913982c9be0d812d3a9345d7 100644
--- a/media/filters/frame_processor.cc
+++ b/media/filters/frame_processor.cc
@@ -356,7 +356,7 @@ bool FrameProcessor::HandlePartialAppendWindowTrimming(
 
   // If we have a preroll buffer see if we can attach it to the first buffer
   // overlapping or after |append_window_start|.
-  if (audio_preroll_buffer_) {
+  if (audio_preroll_buffer_.get()) {
     // We only want to use the preroll buffer if it directly precedes (less
     // than one sample apart) the current buffer.
     const int64 delta = std::abs((audio_preroll_buffer_->timestamp() +