Revert "net: enable SSL_MODE_CBC_RECORD_SPLITTING with OpenSSL."

This reverts commit e06bd133.

This is a preemptive revert to see whether a pagecycler regression can
be attributed to this change. (Even if it can, we still probably want to
make the change, but it's good to know.)

BUG=409214
TBR=davidben@chromium.org

Review URL: https://codereview.chromium.org/547843002

Cr-Commit-Position: refs/heads/master@{#293617}

net/socket/ssl_client_socket_openssl.cc

@@ -752,7 +752,6 @@ int SSLClientSocketOpenSSL::Init() {
   SslSetClearMask mode;
 
   mode.ConfigureFlag(SSL_MODE_RELEASE_BUFFERS, true);
-  mode.ConfigureFlag(SSL_MODE_CBC_RECORD_SPLITTING, true);
 
   mode.ConfigureFlag(SSL_MODE_HANDSHAKE_CUTTHROUGH,
                      ssl_config_.false_start_enabled);