Speed up net_unittests by ~20s by manipulating tcp_pinger timeouts.

net/socket/tcp_pinger.h

Index: net/socket/tcp_pinger.h
diff --git a/net/socket/tcp_pinger.h b/net/socket/tcp_pinger.h
index 0b0bd9b380969864eec266258411aa68d5c9aa1c..37ad8813c2327bb3204b2138273b112371d4893c 100644
--- a/net/socket/tcp_pinger.h
+++ b/net/socket/tcp_pinger.h
@@ -41,9 +41,9 @@ class TCPPinger {
   }
 
   int Ping() {
-    // Default is 10 tries, each with a timeout of 1000ms,
+    // Default is 40 tries, each with a timeout of 250ms,
     // for a total max timeout of 10 seconds.
-    return Ping(base::TimeDelta::FromMilliseconds(1000), 10);
+    return Ping(base::TimeDelta::FromMilliseconds(250), 40);
   }
 
   int Ping(base::TimeDelta tryTimeout, int nTries) {