Remove Go implementation of non-standard ECDHE_PSK_WITH_AES_128_GCM_SHA256.

The BoringSSL implementation was removed in
https://boringssl-review.googlesource.com/5051. No need to have the runner half
around.

Change-Id: I49857f4d01be161df89fb7df93a83240b6a8cb02
Reviewed-on: https://boringssl-review.googlesource.com/5751
Reviewed-by: Adam Langley <agl@google.com>

ssl/test/runner/cipher_suites.go

@@ -119,7 +119,6 @@ var cipherSuites = []*cipherSuite{
 	{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
 	{TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, dheRSAKA, 0, cipher3DES, macSHA1, nil},
 	{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
-	{TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdhePSKKA, suiteECDHE | suiteTLS12 | suitePSK, nil, nil, aeadAESGCM},
 	{TLS_PSK_WITH_RC4_128_SHA, 16, 20, 0, pskKA, suiteNoDTLS | suitePSK, cipherRC4, macSHA1, nil},
 	{TLS_PSK_WITH_AES_128_CBC_SHA, 16, 20, 16, pskKA, suitePSK, cipherAES, macSHA1, nil},
 	{TLS_PSK_WITH_AES_256_CBC_SHA, 32, 20, 16, pskKA, suitePSK, cipherAES, macSHA1, nil},
@@ -411,7 +410,6 @@ const (
 
 // Additional cipher suite IDs, not IANA-assigned.
 const (
-	TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256         uint16 = 0xcafe
 	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   uint16 = 0xcc13
 	TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcc14
 )