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

net/quic/congestion_control/hybrid_slow_start.cc

Index: net/quic/congestion_control/hybrid_slow_start.cc
diff --git a/net/quic/congestion_control/hybrid_slow_start.cc b/net/quic/congestion_control/hybrid_slow_start.cc
index dcd2e4a5bb2a6c0ab9a6bf7f4c1e2b0820ccc3cc..cbdd1bbef1ad912cc7fc8632c06caaa7df2bb699 100644
--- a/net/quic/congestion_control/hybrid_slow_start.cc
+++ b/net/quic/congestion_control/hybrid_slow_start.cc
@@ -19,8 +19,11 @@ HybridSlowStart::HybridSlowStart(const QuicClock* clock)
       started_(false),
       found_ack_train_(false),
       found_delay_(false),
+      round_start_(QuicTime::Zero()),
       end_sequence_number_(0),
-      sample_count_(0) {
+      last_time_(QuicTime::Zero()),
+      sample_count_(0),
+      current_rtt_(QuicTime::Delta::Zero()) {
 }
 
 void HybridSlowStart::Restart() {
@@ -32,7 +35,7 @@ void HybridSlowStart::Reset(QuicPacketSequenceNumber end_sequence_number) {
   DLOG(INFO) << "Reset hybrid slow start @" << end_sequence_number;
   round_start_ = last_time_ = clock_->Now();
   end_sequence_number_ = end_sequence_number;
-  current_rtt_ = QuicTime::Delta();  // Reset to 0.
+  current_rtt_ = QuicTime::Delta::Zero();
   sample_count_ = 0;
   started_ = true;
 }