Web MIDI: MIDI input messages may be lost or cause a crash on OS X

media/midi/midi_manager_mac.cc

Index: media/midi/midi_manager_mac.cc
diff --git a/media/midi/midi_manager_mac.cc b/media/midi/midi_manager_mac.cc
index 8a9e06073e4052aee58f50e663fa67beba4d2bfa..8a9ece014ed7198f9f07f2d08cded115b97d951a 100644
--- a/media/midi/midi_manager_mac.cc
+++ b/media/midi/midi_manager_mac.cc
@@ -287,16 +287,18 @@ void MidiManagerMac::ReadMidi(MIDIEndpointRef source,
   uint32 port_index = source_map_[source];
 
   // Go through each packet and process separately.
+  const MIDIPacket* packet = &packet_list->packet[0];
   for (size_t i = 0; i < packet_list->numPackets; i++) {
     // Each packet contains MIDI data for one or more messages (like note-on).
-    const MIDIPacket &packet = packet_list->packet[i];
-    double timestamp_seconds = MIDITimeStampToSeconds(packet.timeStamp);
+    double timestamp_seconds = MIDITimeStampToSeconds(packet->timeStamp);
 
     ReceiveMidiData(
         port_index,
-        packet.data,
-        packet.length,
+        packet->data,
+        packet->length,
         timestamp_seconds);
+
+    packet = MIDIPacketNext(packet);
   }
 }