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

net/tools/quic/quic_dispatcher.h

 // 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.
 //
 // A server side dispatcher which dispatches a given client's data to their
 // stream.
 
 #ifndef NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
 #define NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
 
@@ skipping 26 matching lines @@
                        public ProcessPacketInterface,
                        public QuicBlockedWriterInterface,
                        public QuicFramerVisitorInterface {
  public:
   // Ideally we'd have a linked_hash_set: the  boolean is unused.
   typedef linked_hash_map<QuicBlockedWriterInterface*,
                           bool,
                           QuicBlockedWriterInterfacePtrHash>
       WriteBlockedList;
 
-  // Due to the way delete_sessions_closure_ is registered, the Dispatcher must
-  // live until server Shutdown. |supported_versions| specifies the std::list
-  // of supported QUIC versions. Takes ownership of |packet_writer_factory|,
-  // which is used to create per-connection writers.
   QuicDispatcher(const QuicConfig& config,
                  const QuicCryptoServerConfig* crypto_config,
                  const QuicVersionVector& supported_versions,
-                 QuicConnectionHelperInterface* helper);
+                 std::unique_ptr<QuicConnectionHelperInterface> helper);
 
   ~QuicDispatcher() override;
 
   // Takes ownership of |writer|.
   void InitializeWithWriter(QuicPacketWriter* writer);
 
   // Process the incoming packet by creating a new session, passing it to
   // an existing session, or passing it to the time wait list.
   void ProcessPacket(const IPEndPoint& server_address,
                      const IPEndPoint& client_address,
@@ skipping 200 matching lines @@
   // The last error set by SetLastError(), which is called by
   // framer_visitor_->OnError().
   QuicErrorCode last_error_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicDispatcher);
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_DISPATCHER_H_