Add quic_map_util.

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 28c936a6efa6e93b7ff6f1b3ae2e68a1246f817d..adef0d787aa60d6a19dc14833dc9605061c3f00f 100644
--- a/net/quic/core/crypto/quic_crypto_client_config.cc
+++ b/net/quic/core/crypto/quic_crypto_client_config.cc
@@ -8,7 +8,6 @@
 #include <memory>
 
 #include "base/metrics/histogram_macros.h"
-#include "base/stl_util.h"
 #include "net/quic/core/crypto/cert_compressor.h"
 #include "net/quic/core/crypto/chacha20_poly1305_encrypter.h"
 #include "net/quic/core/crypto/channel_id.h"
@@ -24,10 +23,10 @@
 #include "net/quic/core/quic_utils.h"
 #include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_logging.h"
+#include "net/quic/platform/api/quic_map_util.h"
 #include "net/quic/platform/api/quic_ptr_util.h"
 #include "net/quic/platform/api/quic_text_utils.h"
 
-using base::ContainsKey;
 using base::StringPiece;
 using std::string;
 
@@ -963,7 +962,7 @@ bool QuicCryptoClientConfig::PopulateFromCanonicalConfig(
 
   QuicServerId suffix_server_id(canonical_suffixes_[i], server_id.port(),
                                 server_id.privacy_mode());
-  if (!ContainsKey(canonical_server_map_, suffix_server_id)) {
+  if (!QuicContainsKey(canonical_server_map_, suffix_server_id)) {
     // This is the first host we've seen which matches the suffix, so make it
     // canonical.
     canonical_server_map_[suffix_server_id] = server_id;