Use clock_gettime instead of base::TimeTicks::Now() in QUIC

net/quic/core/quic_time.h

Index: net/quic/core/quic_time.h
diff --git a/net/quic/core/quic_time.h b/net/quic/core/quic_time.h
index ee4a38c988f17b393453ba13de07884737a45ec1..18ef46f117040f2cd237e9cf518e8949e292e977 100644
--- a/net/quic/core/quic_time.h
+++ b/net/quic/core/quic_time.h
@@ -24,6 +24,8 @@
 
 namespace net {
 
+class QuicClock;
+
 // A QuicTime is a purely relative time. QuicTime values from different clocks
 // cannot be compared to each other. If you need an absolute time, see
 // QuicWallTime, below.
@@ -104,8 +106,6 @@ class QUIC_EXPORT_PRIVATE QuicTime {
     friend class QuicClock;
   };
 
-  explicit QuicTime(base::TimeTicks ticks) : time_(ticks.ToInternalValue()) {}
-
   // Creates a new QuicTime with an internal value of 0.  IsInitialized()
   // will return false for these times.
   static QUICTIME_CONSTEXPR QuicTime Zero() { return QuicTime(0); }
@@ -124,6 +124,8 @@ class QUIC_EXPORT_PRIVATE QuicTime {
   inline bool IsInitialized() const { return 0 != time_; }
 
  private:
+  friend class QuicClock;
+
   friend inline bool operator==(QuicTime lhs, QuicTime rhs);
   friend inline bool operator<(QuicTime lhs, QuicTime rhs);
   friend inline QuicTime operator+(QuicTime lhs, QuicTime::Delta rhs);