Remove implicit conversions from scoped_refptr to T* in media/

media/base/audio_discard_helper.cc

Index: media/base/audio_discard_helper.cc
diff --git a/media/base/audio_discard_helper.cc b/media/base/audio_discard_helper.cc
index 06e7a31e03badee6fa3f7a7fdfd6f6faf7fc5281..8405d0b01b97b2eda7623b0550b929d7472082f2 100644
--- a/media/base/audio_discard_helper.cc
+++ b/media/base/audio_discard_helper.cc
@@ -71,7 +71,7 @@ bool AudioDiscardHelper::ProcessBuffers(
   }
   DCHECK(initialized());
 
-  if (!decoded_buffer) {
+  if (!decoded_buffer.get()) {
     // If there's a one buffer delay for decoding, we need to save it so it can
     // be processed with the next decoder buffer.
     if (first_buffer) {