Pass QuicInMemoryCache directly instead of using a singleton.

net/tools/quic/quic_simple_dispatcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_simple_dispatcher.h"
 
 #include "net/tools/quic/quic_simple_server_session.h"
 
 namespace net {
 
 QuicSimpleDispatcher::QuicSimpleDispatcher(
     const QuicConfig& config,
     const QuicCryptoServerConfig* crypto_config,
     QuicVersionManager* version_manager,
     std::unique_ptr<QuicConnectionHelperInterface> helper,
     std::unique_ptr<QuicCryptoServerStream::Helper> session_helper,
-    std::unique_ptr<QuicAlarmFactory> alarm_factory)
+    std::unique_ptr<QuicAlarmFactory> alarm_factory,
+    QuicInMemoryCache* in_memory_cache)
     : QuicDispatcher(config,
                      crypto_config,
                      version_manager,
                      std::move(helper),
                      std::move(session_helper),
-                     std::move(alarm_factory)) {}
+                     std::move(alarm_factory)),
+      in_memory_cache_(in_memory_cache) {}
 
 QuicSimpleDispatcher::~QuicSimpleDispatcher() {}
 
 QuicServerSessionBase* QuicSimpleDispatcher::CreateQuicSession(
     QuicConnectionId connection_id,
     const QuicSocketAddress& client_address) {
   // The QuicServerSessionBase takes ownership of |connection| below.
   QuicConnection* connection = new QuicConnection(
       connection_id, client_address, helper(), alarm_factory(),
       CreatePerConnectionWriter(),
       /* owns_writer= */ true, Perspective::IS_SERVER, GetSupportedVersions());
 
-  QuicServerSessionBase* session =
-      new QuicSimpleServerSession(config(), connection, this, session_helper(),
-                                  crypto_config(), compressed_certs_cache());
+  QuicServerSessionBase* session = new QuicSimpleServerSession(
+      config(), connection, this, session_helper(), crypto_config(),
+      compressed_certs_cache(), in_memory_cache_);
   session->Initialize();
   return session;
 }
 
 }  // namespace net