Make callers of FromUTC(Local)Exploded in base/ use new time API.

base/metrics/field_trial.cc

Index: base/metrics/field_trial.cc
diff --git a/base/metrics/field_trial.cc b/base/metrics/field_trial.cc
index 430cae0b7287d1c3f400ad64afdc272b3a4fd0dc..600b94ed48391dd483ad73e7036da7d45037c859 100644
--- a/base/metrics/field_trial.cc
+++ b/base/metrics/field_trial.cc
@@ -44,8 +44,14 @@ Time CreateTimeFromParams(int year, int month, int day_of_month) {
   exploded.minute = 0;
   exploded.second = 0;
   exploded.millisecond = 0;
+  Time out_time;
+  if (!Time::FromLocalExploded(exploded, &out_time)) {
+    // TODO(maksims): implement failure handling.
+    // We might just return |out_time|, which is Time(0).
+    NOTIMPLEMENTED();
+  }
 
-  return Time::FromLocalExploded(exploded);
+  return out_time;
 }
 
 // Returns the boundary value for comparing against the FieldTrial's added