Revert changes to startup_metric_utils.cc.

components/startup_metric_utils/browser/startup_metric_utils.cc

Index: components/startup_metric_utils/browser/startup_metric_utils.cc
diff --git a/components/startup_metric_utils/browser/startup_metric_utils.cc b/components/startup_metric_utils/browser/startup_metric_utils.cc
index 3ac80bdafd2e68105a4e4bbadf04ba6ade60cd98..16f41031316b25c2164d31312e976bbb019b6567 100644
--- a/components/startup_metric_utils/browser/startup_metric_utils.cc
+++ b/components/startup_metric_utils/browser/startup_metric_utils.cc
@@ -271,6 +271,7 @@ base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) {
 
 // platform_thread_mac.mm unfortunately doesn't properly support base's
 // thread priority APIs (crbug.com/554651).

[gab, 2016/04/07 00:56:32]

Please update this comment.

+#if !defined(OS_MACOSX)
   static bool statics_initialized = false;
 
   base::ThreadPriority previous_priority = base::ThreadPriority::NORMAL;
@@ -279,15 +280,17 @@ base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) {
     base::PlatformThread::SetCurrentThreadPriority(
         base::ThreadPriority::DISPLAY);
   }
+#endif
 
   static const base::Time time_base = base::Time::Now();
   static const base::TimeTicks trace_ticks_base = base::TimeTicks::Now();
 
+#if !defined(OS_MACOSX)
   if (!statics_initialized) {
     base::PlatformThread::SetCurrentThreadPriority(previous_priority);
   }
-
   statics_initialized = true;
+#endif
 
   // Then use the TimeDelta common ground between the two units to make the
   // conversion.