Replace our homegrown ARRAY_SIZE() with Chrome's arraysize().

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 114 matching lines @@
   DateCacheMock::Rule rules[] = {
     {0, 2, 0, 10, 0, 3600},  // DST from March to November in any year.
     {2010, 2, 0, 7, 20, 3600},  // DST from March to August 20 in 2010.
     {2010, 7, 20, 8, 10, 0},  // No DST from August 20 to September 10 in 2010.
     {2010, 8, 10, 10, 0, 3600},  // DST from September 10 to November in 2010.
   };
 
   int local_offset_ms = -36000000;  // -10 hours.
 
   DateCacheMock* date_cache =
-    new DateCacheMock(local_offset_ms, rules, ARRAY_SIZE(rules));
+    new DateCacheMock(local_offset_ms, rules, arraysize(rules));
 
   reinterpret_cast<Isolate*>(isolate)->set_date_cache(date_cache);
 
   int64_t start_of_2010 = TimeFromYearMonthDay(date_cache, 2010, 0, 1);
   int64_t start_of_2011 = TimeFromYearMonthDay(date_cache, 2011, 0, 1);
   int64_t august_20 = TimeFromYearMonthDay(date_cache, 2010, 7, 20);
   int64_t september_10 = TimeFromYearMonthDay(date_cache, 2010, 8, 10);
   CheckDST((august_20 + september_10) / 2);
   CheckDST(september_10);
   CheckDST(september_10 + 2 * 3600);
@@ skipping 36 matching lines @@
   CHECK_EQ(1, static_cast<int32_t>(date_cache_version->Length()));
   CHECK(date_cache_version->Get(0)->IsNumber());
   CHECK_EQ(0.0, date_cache_version->Get(0)->NumberValue());
 
   v8::Date::DateTimeConfigurationChangeNotification(isolate);
 
   CHECK_EQ(1, static_cast<int32_t>(date_cache_version->Length()));
   CHECK(date_cache_version->Get(0)->IsNumber());
   CHECK_EQ(1.0, date_cache_version->Get(0)->NumberValue());
 }