Make QuicDispatcher's helper argument be a unique_ptr to make ownership

net/tools/quic/quic_dispatcher.cc

Index: net/tools/quic/quic_dispatcher.cc
diff --git a/net/tools/quic/quic_dispatcher.cc b/net/tools/quic/quic_dispatcher.cc
index 6d08fbe2dd8e9d22fe10df7d02c0729e4a372090..7c7a7b284c63a910619068edf51700290ea30a6c 100644
--- a/net/tools/quic/quic_dispatcher.cc
+++ b/net/tools/quic/quic_dispatcher.cc
@@ -41,15 +41,16 @@ class DeleteSessionsAlarm : public QuicAlarm::Delegate {
 
 }  // namespace
 
-QuicDispatcher::QuicDispatcher(const QuicConfig& config,
-                               const QuicCryptoServerConfig* crypto_config,
-                               const QuicVersionVector& supported_versions,
-                               QuicConnectionHelperInterface* helper)
+QuicDispatcher::QuicDispatcher(
+    const QuicConfig& config,
+    const QuicCryptoServerConfig* crypto_config,
+    const QuicVersionVector& supported_versions,
+    std::unique_ptr<QuicConnectionHelperInterface> helper)
     : config_(config),
       crypto_config_(crypto_config),
       compressed_certs_cache_(
           QuicCompressedCertsCache::kQuicCompressedCertsCacheSize),
-      helper_(helper),
+      helper_(std::move(helper)),
       delete_sessions_alarm_(
           helper_->CreateAlarm(new DeleteSessionsAlarm(this))),
       supported_versions_(supported_versions),