Pass QuicInMemoryCache directly instead of using a singleton.

net/tools/quic/quic_simple_server.h

Index: net/tools/quic/quic_simple_server.h
diff --git a/net/tools/quic/quic_simple_server.h b/net/tools/quic/quic_simple_server.h
index 2a79e91bfd9cb345858a7fb925bcdfbba72bddcf..9edb3017560b3bda6ef7bf00b40d2ece61a6e93f 100644
--- a/net/tools/quic/quic_simple_server.h
+++ b/net/tools/quic/quic_simple_server.h
@@ -19,6 +19,7 @@
 #include "net/quic/core/crypto/quic_crypto_server_config.h"
 #include "net/quic/core/quic_clock.h"
 #include "net/quic/core/quic_config.h"
+#include "net/tools/quic/quic_in_memory_cache.h"
 
 namespace net {
 
@@ -37,7 +38,8 @@ class QuicSimpleServer {
       std::unique_ptr<ProofSource> proof_source,
       const QuicConfig& config,
       const QuicCryptoServerConfig::ConfigOptions& crypto_config_options,
-      const QuicVersionVector& supported_versions);
+      const QuicVersionVector& supported_versions,
+      QuicInMemoryCache* in_memory_cache);
 
   virtual ~QuicSimpleServer();
 
@@ -111,6 +113,8 @@ class QuicSimpleServer {
   // The log to use for the socket.
   NetLog net_log_;
 
+  QuicInMemoryCache* in_memory_cache_;
+
   base::WeakPtrFactory<QuicSimpleServer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSimpleServer);