Clean up media header include guards

media/base/fake_text_track_stream.h

Index: media/base/fake_text_track_stream.h
diff --git a/media/base/fake_text_track_stream.h b/media/base/fake_text_track_stream.h
index 6088286bd70b858978ef7e3d7003be45537de428..c21f577294dea0172c6486053758f3a6ffef9a94 100644
--- a/media/base/fake_text_track_stream.h
+++ b/media/base/fake_text_track_stream.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_
+#define MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_
+
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "media/base/audio_decoder_config.h"
@@ -48,3 +51,5 @@ class FakeTextTrackStream : public DemuxerStream {
 };
 
 }  // namespace media
+
+#endif  // MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_