Adding using declarations for std::swap.

net/quic/core/crypto/quic_crypto_client_config.cc

Index: net/quic/core/crypto/quic_crypto_client_config.cc
diff --git a/net/quic/core/crypto/quic_crypto_client_config.cc b/net/quic/core/crypto/quic_crypto_client_config.cc
index aafb36412c72a6005c9a1b9194899a187c1b8b98..d70f79aa5cc9969f86a456dc5f5fdb896d8bacd7 100644
--- a/net/quic/core/crypto/quic_crypto_client_config.cc
+++ b/net/quic/core/crypto/quic_crypto_client_config.cc
@@ -193,6 +193,7 @@ void QuicCryptoClientConfig::CachedState::InvalidateServerConfig() {
   scfg_.reset();
   SetProofInvalid();
   std::queue<QuicConnectionId> empty_queue;
+  using std::swap;
   swap(server_designated_connection_ids_, empty_queue);
 }
 
@@ -237,6 +238,7 @@ void QuicCryptoClientConfig::CachedState::Clear() {
   scfg_.reset();
   ++generation_counter_;
   std::queue<QuicConnectionId> empty_queue;
+  using std::swap;
   swap(server_designated_connection_ids_, empty_queue);
 }