Remove the last of the TLS fallback code.

net/base/net_error_list.h

Index: net/base/net_error_list.h
diff --git a/net/base/net_error_list.h b/net/base/net_error_list.h
index 15bae4673947f5ae603e445acbebaccac688f207..2ea5d9aefc3928033f9b938b614bfb091455a708 100644
--- a/net/base/net_error_list.h
+++ b/net/base/net_error_list.h
@@ -314,9 +314,7 @@ NET_ERROR(WS_THROTTLE_QUEUE_TOO_LARGE, -154)
 // The SSL server certificate changed in a renegotiation.
 NET_ERROR(SSL_SERVER_CERT_CHANGED, -156)
 
-// The SSL server indicated that an unnecessary TLS version fallback was
-// performed.
-NET_ERROR(SSL_INAPPROPRIATE_FALLBACK, -157)
+// Error -157 was removed (SSL_INAPPROPRIATE_FALLBACK).
 
 // Certificate Transparency: All Signed Certificate Timestamps failed to verify.
 NET_ERROR(CT_NO_SCTS_VERIFIED_OK, -158)
@@ -342,9 +340,7 @@ NET_ERROR(SOCKET_SEND_BUFFER_SIZE_UNCHANGEABLE, -163)
 // library.
 NET_ERROR(SSL_CLIENT_AUTH_CERT_BAD_FORMAT, -164)
 
-// The SSL server requires falling back to a version older than the configured
-// minimum fallback version, and thus fallback failed.
-NET_ERROR(SSL_FALLBACK_BEYOND_MINIMUM_VERSION, -165)
+// Error -165 was removed (SSL_FALLBACK_BEYOND_MINIMUM_VERSION).
 
 // Resolving a hostname to an IP address list included the IPv4 address
 // "127.0.53.53". This is a special IP address which ICANN has recommended to