Remove SSL 3.0 implementation.

Update-Note: SSL_CTX_set_min_proto_version(SSL3_VERSION) now fails.
   SSL_OP_NO_SSLv3 is now zero. Internal SSL3-specific "AEAD"s are gone.

Change-Id: I34edb160be40a5eea3e2e0fdea562c6e2adda229
Reviewed-on: https://boringssl-review.googlesource.com/29444
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>

ssl/ssl_aead_ctx.cc

diff --git a/ssl/ssl_aead_ctx.cc b/ssl/ssl_aead_ctx.cc
index 363c959..322b1b5 100644
--- a/ssl/ssl_aead_ctx.cc
+++ b/ssl/ssl_aead_ctx.cc
@@ -42,7 +42,6 @@
       random_variable_nonce_(false),
       xor_fixed_nonce_(false),
       omit_length_in_ad_(false),
-      omit_version_in_ad_(false),
       omit_ad_(false),
       ad_is_header_(false) {
   OPENSSL_memset(fixed_nonce_, 0, sizeof(fixed_nonce_));
@@ -147,7 +146,6 @@
     aead_ctx->variable_nonce_included_in_record_ = true;
     aead_ctx->random_variable_nonce_ = true;
     aead_ctx->omit_length_in_ad_ = true;
-    aead_ctx->omit_version_in_ad_ = (protocol_version == SSL3_VERSION);
   }
 
   return aead_ctx;
@@ -235,10 +233,8 @@
   OPENSSL_memcpy(storage, seqnum, 8);
   size_t len = 8;
   storage[len++] = type;
-  if (!omit_version_in_ad_) {
-    storage[len++] = static_cast<uint8_t>((record_version >> 8));
-    storage[len++] = static_cast<uint8_t>(record_version);
-  }
+  storage[len++] = static_cast<uint8_t>((record_version >> 8));
+  storage[len++] = static_cast<uint8_t>(record_version);
   if (!omit_length_in_ad_) {
     storage[len++] = static_cast<uint8_t>((plaintext_len >> 8));
     storage[len++] = static_cast<uint8_t>(plaintext_len);