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

base/time/time.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Time represents an absolute point in coordinated universal time (UTC),
 // internally represented as microseconds (s/1,000,000) since the Windows epoch
 // (1601-01-01 00:00:00 UTC) (See http://crbug.com/14734).  System-dependent
 // clock interface routines are defined in time_PLATFORM.cc.
 //
 // TimeDelta represents a duration of time, internally represented in
@@ skipping 621 matching lines @@
 #if defined(OS_WIN)
   // Get the absolute value of QPC time drift. For testing.
   static int64 GetQPCDriftMicroseconds();
 
   static TimeTicks FromQPCValue(LONGLONG qpc_value);
 
   // Returns true if the high resolution clock is working on this system.
   // 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
 
   // Returns true if this object has not been initialized.
   bool is_null() const {
     return ticks_ == 0;
   }
 
   // Converts an integer value representing TimeTicks to a class. This is used
@@ skipping 83 matching lines @@
 #endif
 };
 
 inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_