Keep two empty lines between declarations for cpp files

test/cctest/test-date.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 89 matching lines @@
 };
 
 static int64_t TimeFromYearMonthDay(DateCache* date_cache,
                                     int year,
                                     int month,
                                     int day) {
   int64_t result = date_cache->DaysFromYearMonth(year, month);
   return (result + day - 1) * DateCache::kMsPerDay;
 }
 
+
 static void CheckDST(int64_t time) {
   Isolate* isolate = Isolate::Current();
   DateCache* date_cache = isolate->date_cache();
   int64_t actual = date_cache->ToLocal(time);
   int64_t expected = time + date_cache->GetLocalOffsetFromOS() +
                      date_cache->GetDaylightSavingsOffsetFromOS(time / 1000);
   CHECK_EQ(actual, expected);
 }
 
 
@@ skipping 39 matching lines @@
     CheckDST(TimeFromYearMonthDay(date_cache, year, 5, 5));
   }
   CheckDST((august_20 + september_10) / 2);
   CheckDST(september_10);
   CheckDST(september_10 + 2 * 3600);
   CheckDST(september_10 + 2 * 3600 - 1000);
   CheckDST(august_20 + 2 * 3600);
   CheckDST(august_20 + 2 * 3600 - 1000);
   CheckDST(august_20);
 }