Fix windows compilation warning in es_parser_adts.

media/formats/mp2t/es_parser.h

Index: media/formats/mp2t/es_parser.h
diff --git a/media/formats/mp2t/es_parser.h b/media/formats/mp2t/es_parser.h
index 96785eafb73be95b18b59f9ac535b35769eb5c32..a1959c20a341ca6c7752c796e62faf561b5bce27 100644
--- a/media/formats/mp2t/es_parser.h
+++ b/media/formats/mp2t/es_parser.h
@@ -9,6 +9,7 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
+#include "media/base/media_export.h"
 #include "media/base/stream_parser_buffer.h"
 
 namespace media {
@@ -17,7 +18,7 @@ class StreamParserBuffer;
 
 namespace mp2t {
 
-class EsParser {
+class MEDIA_EXPORT EsParser {
  public:
   typedef base::Callback<void(scoped_refptr<StreamParserBuffer>)> EmitBufferCB;