Fix Integer-overflow in base::Time::FromExploded.

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). System-dependent clock interface routines are
 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump
 // around as the operating system makes adjustments to synchronize (e.g., with
 // NTP servers). Thus, client code that uses the Time class must account for
@@ skipping 527 matching lines @@
     return time;
   }
   static Time FromLocalExploded(const Exploded& exploded) {
     base::Time time;
     ignore_result(FromLocalExploded(exploded, &time));
     return time;
   }
 
   // Converts an exploded structure representing either the local time or UTC
   // into a Time class. Returns false on a failure when, for example, a day of
-  // month is set to 31 on a 28-30 day month.
+  // month is set to 31 on a 28-30 day month. Returns Time(0) on overflow.
   static bool FromUTCExploded(const Exploded& exploded,
                               Time* time) WARN_UNUSED_RESULT {
     return FromExploded(false, exploded, time);
   }
   static bool FromLocalExploded(const Exploded& exploded,
                                 Time* time) WARN_UNUSED_RESULT {
     return FromExploded(true, exploded, time);
   }
 
   // Converts a string representation of time to a Time object.
@@ skipping 283 matching lines @@
   static void WaitUntilInitializedWin();
 #endif
 };
 
 // For logging use only.
 BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks);
 
 }  // namespace base
 
 #endif  // BASE_TIME_TIME_H_