Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/quic/quic_session_test.cc

Index: net/quic/quic_session_test.cc
diff --git a/net/quic/quic_session_test.cc b/net/quic/quic_session_test.cc
index 2c180737aba8573b9f51d88d7cfb55debd184fcc..770b15dc8924be519ec1037a21475591ea31bf14 100644
--- a/net/quic/quic_session_test.cc
+++ b/net/quic/quic_session_test.cc
@@ -197,6 +197,7 @@ class QuicSessionTestBase : public ::testing::TestWithParam<QuicVersion> {
   explicit QuicSessionTestBase(Perspective perspective)
       : connection_(
             new StrictMock<MockConnection>(&helper_,
+                                           &alarm_factory_,
                                            perspective,
                                            SupportedVersions(GetParam()))),
         session_(connection_) {
@@ -257,6 +258,7 @@ class QuicSessionTestBase : public ::testing::TestWithParam<QuicVersion> {
   QuicVersion version() const { return connection_->version(); }
 
   MockConnectionHelper helper_;
+  MockAlarmFactory alarm_factory_;
   StrictMock<MockConnection>* connection_;
   TestSession session_;
   set<QuicStreamId> closed_streams_;