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

net/quic/quic_time.h

Index: net/quic/quic_time.h
diff --git a/net/quic/quic_time.h b/net/quic/quic_time.h
index e5ca02a40bff1f9d73e7355ade369179186e248e..a1fb6a382eb47919e2dc1c975f0712aa6645142e 100644
--- a/net/quic/quic_time.h
+++ b/net/quic/quic_time.h
@@ -23,14 +23,14 @@ class NET_EXPORT_PRIVATE QuicTime {
   // time, stored in microsecond resolution.
   class NET_EXPORT_PRIVATE Delta {
    public:
-    // Default constructor initializes to 0.
-    Delta();
-
     explicit Delta(base::TimeDelta delta);
 
     // Create a object with infinite offset time.
     static Delta Infinite();
 
+    // Create a object with infinite offset time.
+    static Delta Zero();
+
     // Converts a number of milliseconds to a time offset.
     static Delta FromMilliseconds(int64 ms);
 
@@ -60,11 +60,12 @@ class NET_EXPORT_PRIVATE QuicTime {
     friend class QuicTime;
   };
 
-  // Default constructor initializes to time 0.
-  QuicTime();
-
   explicit QuicTime(base::TimeTicks ticks);
 
+  // Creates a new QuicTime with an internal value of 0.  IsInitialized()
+  // will return true for these times.
+  static QuicTime Zero();
+
   // Create a new QuicTime holding the time_ms.
   static QuicTime FromMilliseconds(int64 time_ms);