Split out QuicAlarm creation from QuicConnectionHelper to new QuicAlarmFactory.

net/quic/quic_stream_sequencer_test.cc

Index: net/quic/quic_stream_sequencer_test.cc
diff --git a/net/quic/quic_stream_sequencer_test.cc b/net/quic/quic_stream_sequencer_test.cc
index ed5511928e3aab9ffa866a04718b896e7f80871e..f6bd2478585ebfb2c52dff09d97d5f74284b5200 100644
--- a/net/quic/quic_stream_sequencer_test.cc
+++ b/net/quic/quic_stream_sequencer_test.cc
@@ -69,7 +69,9 @@ class QuicStreamSequencerTest : public ::testing::Test {
 
  protected:
   QuicStreamSequencerTest()
-      : connection_(new MockConnection(&helper_, Perspective::IS_CLIENT)),
+      : connection_(new MockConnection(&helper_,
+                                       &alarm_factory_,
+                                       Perspective::IS_CLIENT)),
         session_(connection_),
         stream_(&session_, 1),
         sequencer_(new QuicStreamSequencer(&stream_, &clock_)) {}
@@ -146,6 +148,7 @@ class QuicStreamSequencerTest : public ::testing::Test {
   }
 
   MockConnectionHelper helper_;
+  MockAlarmFactory alarm_factory_;
   MockConnection* connection_;
   MockClock clock_;
   MockQuicSpdySession session_;