media: Fix mojo DecoderBuffer type converter

media/mojo/common/media_type_converters.cc

Index: media/mojo/common/media_type_converters.cc
diff --git a/media/mojo/common/media_type_converters.cc b/media/mojo/common/media_type_converters.cc
index 42e2febdb2ee63ba5fe13650af21dd3d5f43880a..d809016a9a8255f185cb822711d8a8e41bd614d4 100644
--- a/media/mojo/common/media_type_converters.cc
+++ b/media/mojo/common/media_type_converters.cc
@@ -473,7 +473,10 @@ TypeConverter<scoped_refptr<media::DecoderBuffer>,
   scoped_refptr<media::DecoderBuffer> buffer(
       new media::DecoderBuffer(input->data_size));
 
-  buffer->CopySideDataFrom(&input->side_data.front(), input->side_data.size());
+  if (!input->side_data.empty()) {
+    buffer->CopySideDataFrom(&input->side_data.front(),
+                             input->side_data.size());
+  }
 
   buffer->set_timestamp(
       base::TimeDelta::FromMicroseconds(input->timestamp_usec));