Remove alert mapping machinery.

For TLS, this machinery only exists to swallow no_certificate alerts
which only get sent in an SSL 3.0 codepath anyway. It's much less a
no-op for SSL 3.0 which, strictly speaking, has only a subset of TLS's
alerts.

This gets messy around version negotiation because of the complex
relationship between enc_method, have_version, and version which all get
set at different times. Given that SSL 3.0 is nearly dead and all these
alerts are fatal to the connection anyway, this doesn't seem worth
carrying around. (It doesn't work very well anyway. An SSLv3-only server
may still send a record_overflow alert before version negotiation.)

This removes the last place enc_method is accessed prior to version
negotiation.

Change-Id: I79a704259fca69e4df76bd5a6846c9373f46f5a9
Reviewed-on: https://boringssl-review.googlesource.com/6843
Reviewed-by: Adam Langley <alangley@gmail.com>
diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index baafc06..75f56ce 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -3249,11 +3249,7 @@
 				} else {
 					shouldFail = true
 					expectedError = ":UNSUPPORTED_PROTOCOL:"
-					if runnerVers.version > VersionSSL30 {
-						expectedLocalError = "remote error: protocol version not supported"
-					} else {
-						expectedLocalError = "remote error: handshake failure"
-					}
+					expectedLocalError = "remote error: protocol version not supported"
 				}
 
 				testCases = append(testCases, testCase{