Fix two uninitialized variables in media

media/filters/stream_parser_factory.cc

Index: media/filters/stream_parser_factory.cc
diff --git a/media/filters/stream_parser_factory.cc b/media/filters/stream_parser_factory.cc
index dd0e95aa82b4c3a69667f894d931aa8ec1600529..141e3849791439ab3d5acce36256a25d8ccb030a 100644
--- a/media/filters/stream_parser_factory.cc
+++ b/media/filters/stream_parser_factory.cc
@@ -99,13 +99,14 @@ static StreamParser* BuildWebMParser(
 }
 
 #if defined(USE_PROPRIETARY_CODECS)
+static const int kNullObjectType = 0;
 // AAC Object Type IDs that Chrome supports.
 static const int kAACLCObjectType = 2;
 static const int kAACSBRObjectType = 5;
 
 static int GetMP4AudioObjectType(const std::string& codec_id,
                                  const LogCB& log_cb) {
-  int audio_object_type;
+  int audio_object_type = kNullObjectType;
   std::vector<std::string> tokens;
   if (Tokenize(codec_id, ".", &tokens) != 3 ||
       tokens[0] != "mp4a" || tokens[1] != "40" ||