Make QuicDispatcher's helper and alarm factory arguments unique_ptrs to make ownership clear.

net/quic/quic_stream_factory.h

Index: net/quic/quic_stream_factory.h
diff --git a/net/quic/quic_stream_factory.h b/net/quic/quic_stream_factory.h
index c7f10d121f68ae8f22f9cb5242cd8dda62f4b3b5..5c0ae0d76967974cc94045289af9b9e3923276b5 100644
--- a/net/quic/quic_stream_factory.h
+++ b/net/quic/quic_stream_factory.h
@@ -48,6 +48,7 @@ class CTVerifier;
 class HostResolver;
 class HttpServerProperties;
 class QuicClock;
+class QuicChromiumAlarmFactory;
 class QuicChromiumClientSession;
 class QuicChromiumConnectionHelper;
 class QuicCryptoClientStreamFactory;
@@ -304,6 +305,7 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
   base::TimeDelta GetTimeDelayForWaitingJob(const QuicServerId& server_id);
 
   QuicChromiumConnectionHelper* helper() { return helper_.get(); }
+  QuicChromiumAlarmFactory* alarm_factory() { return alarm_factory_.get(); }
 
   bool enable_port_selection() const { return enable_port_selection_; }
 
@@ -429,7 +431,8 @@ class NET_EXPORT_PRIVATE QuicStreamFactory
 
   // The helper used for all connections.
   std::unique_ptr<QuicChromiumConnectionHelper> helper_;
-
+  // The alarm factory used for all connnections.
+  std::unique_ptr<QuicChromiumAlarmFactory> alarm_factory_;
   // Contains owning pointers to all sessions that currently exist.
   SessionIdMap all_sessions_;
   // Contains non-owning pointers to currently active session