Initialize the now_funciton to the HighResNowWrapper in case High Res is supported

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 79346f1f0569cab24a99e1f5411cd0008826a28a..4d72a198a0515008a5f540d1a77dc622a0224067 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -639,14 +639,6 @@ class BASE_EXPORT TimeTicks {
   // This is only for testing.
   static bool IsHighResClockWorking();
 
-  // Enable high resolution time for TimeTicks::Now(). This function will
-  // test for the availability of a working implementation of
-  // QueryPerformanceCounter(). If one is not available, this function does
-  // nothing and the resolution of Now() remains 1ms. Otherwise, all future
-  // calls to TimeTicks::Now() will have the higher resolution provided by QPC.
-  // Returns true if high resolution time was successfully enabled.
-  static bool SetNowIsHighResNowIfSupported();
-
   // Returns a time value that is NOT rollover protected.
   static TimeTicks UnprotectedNow();
 #endif