Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/quic/test_tools/mock_quic_dispatcher.cc

Index: net/quic/test_tools/mock_quic_dispatcher.cc
diff --git a/net/quic/test_tools/mock_quic_dispatcher.cc b/net/quic/test_tools/mock_quic_dispatcher.cc
index a31365198c872028f4b66dbaa5d13d3d8d56c83c..2f929128b3b0bd630a9e316bd6534991ecbaa1b2 100644
--- a/net/quic/test_tools/mock_quic_dispatcher.cc
+++ b/net/quic/test_tools/mock_quic_dispatcher.cc
@@ -12,8 +12,13 @@ namespace test {
 MockQuicDispatcher::MockQuicDispatcher(
     const QuicConfig& config,
     const QuicCryptoServerConfig* crypto_config,
-    QuicConnectionHelperInterface* helper)
-    : QuicDispatcher(config, crypto_config, QuicSupportedVersions(), helper) {}
+    QuicConnectionHelperInterface* helper,
+    QuicAlarmFactory* alarm_factory)
+    : QuicDispatcher(config,
+                     crypto_config,
+                     QuicSupportedVersions(),
+                     helper,
+                     alarm_factory) {}
 
 MockQuicDispatcher::~MockQuicDispatcher() {}