Remove default constructors for QuicTime and QuicTime::Delta and used static Zero() methods instead…

net/quic/test_tools/mock_clock.cc

Index: net/quic/test_tools/mock_clock.cc
diff --git a/net/quic/test_tools/mock_clock.cc b/net/quic/test_tools/mock_clock.cc
index 557d8dbaef2e46330cb003e45a1a4d5025ef5b6b..ada94a14e0fd11898fa23f76dd0fca2d806ad49d 100644
--- a/net/quic/test_tools/mock_clock.cc
+++ b/net/quic/test_tools/mock_clock.cc
@@ -6,7 +6,7 @@
 
 namespace net {
 
-MockClock::MockClock() {
+MockClock::MockClock() : now_(QuicTime::Zero()) {
 }
 
 MockClock::~MockClock() {
@@ -24,7 +24,7 @@ QuicTime MockClock::Now() const {
 base::TimeTicks MockClock::NowInTicks() const {
   base::TimeTicks ticks;
   return ticks + base::TimeDelta::FromMicroseconds(
-      now_.Subtract(QuicTime()).ToMicroseconds());
+      now_.Subtract(QuicTime::Zero()).ToMicroseconds());
 }
 
 }  // namespace net