Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 60f5395be74c50800270ee67b78c826fed2572bd..c8a132f6e52ae99490232982c2eaa9721050d8db 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -204,6 +204,7 @@ class MtuDiscoveryAckListener : public QuicAckListenerInterface {
 QuicConnection::QuicConnection(QuicConnectionId connection_id,
                                IPEndPoint address,
                                QuicConnectionHelperInterface* helper,
+                               QuicAlarmFactory* alarm_factory,
                                QuicPacketWriter* writer,
                                bool owns_writer,
                                Perspective perspective,
@@ -212,6 +213,7 @@ QuicConnection::QuicConnection(QuicConnectionId connection_id,
               helper->GetClock()->ApproximateNow(),
               perspective),
       helper_(helper),
+      alarm_factory_(alarm_factory),
       per_packet_options_(nullptr),
       writer_(writer),
       owns_writer_(owns_writer),
@@ -248,17 +250,22 @@ QuicConnection::QuicConnection(QuicConnectionId connection_id,
       pending_retransmission_alarm_(false),
       defer_send_in_response_to_packets_(false),
       arena_(),
-      ack_alarm_(helper->CreateAlarm(arena_.New<AckAlarm>(this), &arena_)),
+      ack_alarm_(
+          alarm_factory_->CreateAlarm(arena_.New<AckAlarm>(this), &arena_)),
       retransmission_alarm_(
-          helper->CreateAlarm(arena_.New<RetransmissionAlarm>(this), &arena_)),
-      send_alarm_(helper->CreateAlarm(arena_.New<SendAlarm>(this), &arena_)),
+          alarm_factory_->CreateAlarm(arena_.New<RetransmissionAlarm>(this),
+                                      &arena_)),
+      send_alarm_(
+          alarm_factory_->CreateAlarm(arena_.New<SendAlarm>(this), &arena_)),
       resume_writes_alarm_(
-          helper->CreateAlarm(arena_.New<SendAlarm>(this), &arena_)),
+          alarm_factory_->CreateAlarm(arena_.New<SendAlarm>(this), &arena_)),
       timeout_alarm_(
-          helper->CreateAlarm(arena_.New<TimeoutAlarm>(this), &arena_)),
-      ping_alarm_(helper->CreateAlarm(arena_.New<PingAlarm>(this), &arena_)),
+          alarm_factory_->CreateAlarm(arena_.New<TimeoutAlarm>(this), &arena_)),
+      ping_alarm_(
+          alarm_factory_->CreateAlarm(arena_.New<PingAlarm>(this), &arena_)),
       mtu_discovery_alarm_(
-          helper->CreateAlarm(arena_.New<MtuDiscoveryAlarm>(this), &arena_)),
+          alarm_factory_->CreateAlarm(arena_.New<MtuDiscoveryAlarm>(this),
+                                      &arena_)),
       visitor_(nullptr),
       debug_visitor_(nullptr),
       packet_generator_(connection_id_,