Lint fix for webrtc/modules/video_coding PART 3!

Trying to submit all changes at once proved impossible since there were
too many changes in too many files. The changes to PRESUBMIT.py
will be uploaded in the last CL.
(original CL: https://codereview.webrtc.org/1528503003/)

BUG=webrtc:5309
TBR=mflodman@webrtc.org

Review URL: https://codereview.webrtc.org/1540243002

Cr-Commit-Position: refs/heads/master@{#11105}
diff --git a/webrtc/modules/video_coding/test/receiver_tests.h b/webrtc/modules/video_coding/test/receiver_tests.h
index 9b9b377..d6bac07 100644
--- a/webrtc/modules/video_coding/test/receiver_tests.h
+++ b/webrtc/modules/video_coding/test/receiver_tests.h
@@ -11,6 +11,9 @@
 #ifndef WEBRTC_MODULES_VIDEO_CODING_TEST_RECEIVER_TESTS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_TEST_RECEIVER_TESTS_H_
 
+#include <stdio.h>
+#include <string>
+
 #include "webrtc/common_types.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp.h"
@@ -19,12 +22,9 @@
 #include "webrtc/modules/video_coding/test/video_source.h"
 #include "webrtc/typedefs.h"
 
-#include <stdio.h>
-#include <string>
-
 class RtpDataCallback : public webrtc::NullRtpData {
  public:
-  RtpDataCallback(webrtc::VideoCodingModule* vcm) : vcm_(vcm) {}
+  explicit RtpDataCallback(webrtc::VideoCodingModule* vcm) : vcm_(vcm) {}
   virtual ~RtpDataCallback() {}
 
   int32_t OnReceivedPayloadData(
@@ -40,4 +40,4 @@
 
 int RtpPlay(const CmdArgs& args);
 
-#endif // WEBRTC_MODULES_VIDEO_CODING_TEST_RECEIVER_TESTS_H_
+#endif  // WEBRTC_MODULES_VIDEO_CODING_TEST_RECEIVER_TESTS_H_