Pass QuicInMemoryCache directly instead of using a singleton.

net/quic/test_tools/mock_quic_dispatcher.h

 // Copyright 2014 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.
 
 #ifndef NET_QUIC_TEST_TOOLS_MOCK_QUIC_DISPATCHER_H_
 #define NET_QUIC_TEST_TOOLS_MOCK_QUIC_DISPATCHER_H_
 
 #include "base/macros.h"
 #include "net/quic/core/crypto/quic_crypto_server_config.h"
 #include "net/quic/core/quic_config.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/tools/quic/quic_simple_dispatcher.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace net {
 namespace test {
 
 class MockQuicDispatcher : public QuicSimpleDispatcher {
  public:
   MockQuicDispatcher(
       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);
 
   ~MockQuicDispatcher() override;
 
   MOCK_METHOD3(ProcessPacket,
                void(const QuicSocketAddress& server_address,
                     const QuicSocketAddress& client_address,
                     const QuicReceivedPacket& packet));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockQuicDispatcher);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_MOCK_QUIC_DISPATCHER_H_