Update includes for webrtc/{base => rtc_base} rename (2/3)

webrtc/media/base/codec_unittest.cc

Index: webrtc/media/base/codec_unittest.cc
diff --git a/webrtc/media/base/codec_unittest.cc b/webrtc/media/base/codec_unittest.cc
index f59304ca9def33dcf40f15134287086380e42b18..26966bbcba18a4d80033e437223cf947e17843ad 100644
--- a/webrtc/media/base/codec_unittest.cc
+++ b/webrtc/media/base/codec_unittest.cc
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/base/gunit.h"
 #include "webrtc/media/base/codec.h"
+#include "webrtc/rtc_base/gunit.h"
 
 using cricket::AudioCodec;
 using cricket::Codec;