Replaces instances of the deprecated TimeTicks::HighResNow() with TimeTicks::Now().

base/time/time_mac.cc

 // 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.
 
 #include "base/time/time.h"
 
 #include <CoreFoundation/CFDate.h>
 #include <CoreFoundation/CFTimeZone.h>
 #include <mach/mach.h>
 #include <mach/mach_time.h>
@@ skipping 212 matching lines @@
   return true;
 }
 
 // static
 TimeTicks TimeTicks::ThreadNow() {
   return TimeTicks(ComputeThreadTicks());
 }
 
 // static
 TimeTicks TimeTicks::NowFromSystemTraceTime() {
-  return HighResNow();
+  return Now();
 }
 
 }  // namespace base