Call SetDefaults from the QuicConfig constructor instead of requiring

net/quic/quic_config.h

Index: net/quic/quic_config.h
diff --git a/net/quic/quic_config.h b/net/quic/quic_config.h
index 6d312e3b220813736c27ebf93a4e141e1601b2d2..7be4569257ce88e71f28b8b574a2e92146ea9f3b 100644
--- a/net/quic/quic_config.h
+++ b/net/quic/quic_config.h
@@ -370,9 +370,6 @@ class NET_EXPORT_PRIVATE QuicConfig {
 
   bool negotiated() const;
 
-  // SetDefaults sets the members to sensible, default values.
-  void SetDefaults();
-
   // ToHandshakeMessage serialises the settings in this object as a series of
   // tags /value pairs and adds them to |out|.
   void ToHandshakeMessage(CryptoHandshakeMessage* out) const;
@@ -386,6 +383,9 @@ class NET_EXPORT_PRIVATE QuicConfig {
  private:
   friend class test::QuicConfigPeer;
 
+  // SetDefaults sets the members to sensible, default values.
+  void SetDefaults();
+
   // Configurations options that are not negotiated.
   // Maximum time the session can be alive before crypto handshake is finished.
   QuicTime::Delta max_time_before_crypto_handshake_;