base: Remove the string logging from CHECK().

net/tools/quic/quic_client_base.cc

Index: net/tools/quic/quic_client_base.cc
diff --git a/net/tools/quic/quic_client_base.cc b/net/tools/quic/quic_client_base.cc
index 1b7ed1ed4ab747cac2af21c96f3644645ab47257..0695ba2690dc506c311aec3462903a3a223cf749 100644
--- a/net/tools/quic/quic_client_base.cc
+++ b/net/tools/quic/quic_client_base.cc
@@ -378,8 +378,8 @@ QuicConnectionId QuicClientBase::GetNextServerDesignatedConnectionId() {
       crypto_config_.LookupOrCreate(server_id_);
   // If the cached state indicates that we should use a server-designated
   // connection ID, then return that connection ID.
-  CHECK(cached != nullptr) << "QuicClientCryptoConfig::LookupOrCreate returned "
-                           << "unexpected nullptr.";
+  // QuicClientCryptoConfig::LookupOrCreate returned unexpected nullptr.
+  CHECK(cached != nullptr);
   return cached->has_server_designated_connection_id()
              ? cached->GetNextServerDesignatedConnectionId()
              : 0;