Use higher precision to store the login database's date_created field.

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 641f465af3e471afc3b4833b2c6b2a9faf122d8e..9cb007ec222b3ec8f4e13a57780e510e1e2ca5d8 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -232,6 +232,10 @@ class BASE_EXPORT Time {
   static const int64 kNanosecondsPerSecond = kNanosecondsPerMicrosecond *
                                              kMicrosecondsPerSecond;
 
+  // The representation of Jan 1, 1970 UTC in microseconds since the
+  // platform-dependent epoch.
+  static const int64 kTimeTToMicrosecondsOffset;
+
 #if !defined(OS_WIN)
   // On Mac & Linux, this value is the delta from the Windows epoch of 1601 to
   // the Posix delta of 1970. This is used for migrating between the old
@@ -492,10 +496,6 @@ class BASE_EXPORT Time {
                                  bool is_local,
                                  Time* parsed_time);
 
-  // The representation of Jan 1, 1970 UTC in microseconds since the
-  // platform-dependent epoch.
-  static const int64 kTimeTToMicrosecondsOffset;
-
   // Time in microseconds in UTC.
   int64 us_;
 };