Enable cpplint in media/

Bug: webrtc:5584
Change-Id: I2fd1395d35596d9002e19cc90fcda3a5d4cde9e7
Reviewed-on: https://webrtc-review.googlesource.com/16564
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20504}
diff --git a/media/base/rtpdataengine.cc b/media/base/rtpdataengine.cc
index 47977e8..cacf973 100644
--- a/media/base/rtpdataengine.cc
+++ b/media/base/rtpdataengine.cc
@@ -10,6 +10,8 @@
 
 #include "media/base/rtpdataengine.h"
 
+#include <map>
+
 #include "media/base/codec.h"
 #include "media/base/mediaconstants.h"
 #include "media/base/rtputils.h"