Reland "Add base::TimeDelta::Max()" again.

sync/sessions/nudge_tracker.cc

Index: sync/sessions/nudge_tracker.cc
diff --git a/sync/sessions/nudge_tracker.cc b/sync/sessions/nudge_tracker.cc
index 22a9fe088bd52099fee065ae2dbf02ab29a3c725..5b599b8bc7f483504308b4d2583c149542fdad13 100644
--- a/sync/sessions/nudge_tracker.cc
+++ b/sync/sessions/nudge_tracker.cc
@@ -174,11 +174,9 @@ bool NudgeTracker::IsTypeThrottled(ModelType type) const {
 base::TimeDelta NudgeTracker::GetTimeUntilNextUnthrottle(
     base::TimeTicks now) const {
   DCHECK(IsAnyTypeThrottled()) << "This function requires a pending unthrottle";
-  const base::TimeDelta kMaxTimeDelta =
-      base::TimeDelta::FromInternalValue(kint64max);
 
   // Return min of GetTimeUntilUnthrottle() values for all IsThrottled() types.
-  base::TimeDelta time_until_next_unthrottle = kMaxTimeDelta;
+  base::TimeDelta time_until_next_unthrottle = base::TimeDelta::Max();
   for (TypeTrackerMap::const_iterator it = type_trackers_.begin();
        it != type_trackers_.end(); ++it) {
     if (it->second.IsThrottled()) {
@@ -187,7 +185,7 @@ base::TimeDelta NudgeTracker::GetTimeUntilNextUnthrottle(
                    it->second.GetTimeUntilUnthrottle(now));
     }
   }
-  DCHECK(kMaxTimeDelta != time_until_next_unthrottle);
+  DCHECK(!time_until_next_unthrottle.is_max());
 
   return time_until_next_unthrottle;
 }