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.h b/media/base/rtpdataengine.h
index 7dd182e..525bc02 100644
--- a/media/base/rtpdataengine.h
+++ b/media/base/rtpdataengine.h
@@ -11,6 +11,7 @@
 #ifndef MEDIA_BASE_RTPDATAENGINE_H_
 #define MEDIA_BASE_RTPDATAENGINE_H_
 
+#include <map>
 #include <memory>
 #include <string>
 #include <vector>
@@ -61,7 +62,7 @@
 
 class RtpDataMediaChannel : public DataMediaChannel {
  public:
-  RtpDataMediaChannel(const MediaConfig& config);
+  explicit RtpDataMediaChannel(const MediaConfig& config);
   virtual ~RtpDataMediaChannel();
 
   virtual bool SetSendParameters(const DataSendParameters& params);