Cleanup MRL initialization

Summary:
Let's cleanup unused code since new MRL initializer is already being used in prod:
https://www.internalfb.com/code/configerator/[18f6e91907d68c4946560bea161a59eefe30deca]/source/thrift/flags_overrides.cconf?lines=11300-11305

Reviewed By: AjanthanAsogamoorthy

Differential Revision: D67864414

fbshipit-source-id: 7633da8180537470e44e316a37c9e197df39231a

thrift/lib/cpp2/server/ThriftServer.cpp

@@ -91,7 +91,6 @@ THRIFT_FLAG_DEFINE_bool(server_enable_stoptls, false);
 
 THRIFT_FLAG_DEFINE_bool(enable_mrl_check_for_thrift_server, false);
 THRIFT_FLAG_DEFINE_bool(enforce_mrl_check_for_thrift_server, false);
-THRIFT_FLAG_DEFINE_bool(migrate_mrl_initializer_for_thrift_server, false);
 
 THRIFT_FLAG_DEFINE_bool(dump_snapshot_on_long_shutdown, true);
 
@@ -2199,11 +2198,6 @@ folly::observer::Observer<bool> ThriftServer::enforceTLSCertRevocation() {
   return THRIFT_FLAG_OBSERVE(enforce_mrl_check_for_thrift_server);
 }
 
-folly::observer::Observer<bool>
-ThriftServer::migrateTLSCertRevocationInitializer() {
-  return THRIFT_FLAG_OBSERVE(migrate_mrl_initializer_for_thrift_server);
-}
-
 folly::observer::Observer<bool> ThriftServer::enableReceivingDelegatedCreds() {
   return THRIFT_FLAG_OBSERVE(server_fizz_enable_receiving_dc);
 }

thrift/lib/cpp2/server/ThriftServer.h

@@ -2316,16 +2316,13 @@ class ThriftServer : public apache::thrift::concurrency::Runnable,
         [observer = std::move(contextObserver),
          tlsRevocationObserver = enableTLSCertRevocation(),
          tlsRevocationEnforcementObserver = enforceTLSCertRevocation(),
-         tlsCertRevocationInitializeObserver =
-             migrateTLSCertRevocationInitializer(),
          hybridKexObserver = enableHybridKex(),
          aegisObserver = enableAegis(),
          pskModeObserver = preferPskKe(),
          dcReceiveObserver = enableReceivingDelegatedCreds(),
          dcObserver = enablePresentingDelegatedCredentials()]() {
           (void)**tlsRevocationObserver;
           (void)**tlsRevocationEnforcementObserver;
-          (void)**tlsCertRevocationInitializeObserver;
           (void)**hybridKexObserver;
           (void)**aegisObserver;
           (void)**pskModeObserver;
@@ -2533,7 +2530,6 @@ class ThriftServer : public apache::thrift::concurrency::Runnable,
 
   static folly::observer::Observer<bool> enableTLSCertRevocation();
   static folly::observer::Observer<bool> enforceTLSCertRevocation();
-  static folly::observer::Observer<bool> migrateTLSCertRevocationInitializer();
 
   static folly::observer::Observer<bool> enableReceivingDelegatedCreds();