Replace NULL with nullptr in all C++ files.

webrtc/examples/peerconnection/server/main.cc

Index: webrtc/examples/peerconnection/server/main.cc
diff --git a/webrtc/examples/peerconnection/server/main.cc b/webrtc/examples/peerconnection/server/main.cc
index 44f42a659534f31644bd756753108bd52fa26949..437566262fc2d86a19acd608de8fda5ef6f40359 100644
--- a/webrtc/examples/peerconnection/server/main.cc
+++ b/webrtc/examples/peerconnection/server/main.cc
@@ -61,7 +61,7 @@ int main(int argc, char** argv) {
     return 0;
   }
 
-  int port = strtol((parser.GetFlag("port")).c_str(), NULL, 10);
+  int port = strtol((parser.GetFlag("port")).c_str(), nullptr, 10);
 
   // Abort if the user specifies a port that is outside the allowed
   // range [1, 65535].
@@ -95,7 +95,8 @@ int main(int argc, char** argv) {
       FD_SET((*i)->socket(), &socket_set);
 
     struct timeval timeout = { 10, 0 };
-    if (select(FD_SETSIZE, &socket_set, NULL, NULL, &timeout) == SOCKET_ERROR) {
+    if (select(FD_SETSIZE, &socket_set, nullptr, nullptr, &timeout) ==
+        SOCKET_ERROR) {
       printf("select failed\n");
       break;
     }