Rename rtc_base/ssl_stream_adapter.h constants.

Uppercase constants are more likely to conflict with macros (for
example rtc::SRTP_AES128_CM_SHA1_80 and OpenSSL SRTP_AES128_CM_SHA1_80).

This CL renames some constants and follows the C++ style guide.

Bug: webrtc:12997
Change-Id: I2398232568b352f88afed571a9b698040bb81c30
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226564
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34553}
diff --git a/pc/test/integration_test_helpers.h b/pc/test/integration_test_helpers.h
index 9ec9b0e..af59a83 100644
--- a/pc/test/integration_test_helpers.h
+++ b/pc/test/integration_test_helpers.h
@@ -150,8 +150,8 @@
 
 // SRTP cipher name negotiated by the tests. This must be updated if the
 // default changes.
-static const int kDefaultSrtpCryptoSuite = rtc::SRTP_AES128_CM_SHA1_80;
-static const int kDefaultSrtpCryptoSuiteGcm = rtc::SRTP_AEAD_AES_256_GCM;
+static const int kDefaultSrtpCryptoSuite = rtc::kSrtpAes128CmSha1_80;
+static const int kDefaultSrtpCryptoSuiteGcm = rtc::kSrtpAeadAes256Gcm;
 
 static const SocketAddress kDefaultLocalAddress("192.168.1.1", 0);