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

test/cctest/test-object-observe.cc

Index: test/cctest/test-object-observe.cc
diff --git a/test/cctest/test-object-observe.cc b/test/cctest/test-object-observe.cc
index 679569e27c16e9843c85b3fd881bee9107b2a170..d208a26922d5c2a97264590092d63fecfd080e33 100644
--- a/test/cctest/test-object-observe.cc
+++ b/test/cctest/test-object-observe.cc
@@ -253,7 +253,7 @@ static void ExpectRecords(v8::Isolate* isolate,
 
 #define EXPECT_RECORDS(records, expectations)                \
   ExpectRecords(CcTest::isolate(), records, expectations, \
-                ARRAY_SIZE(expectations))
+                arraysize(expectations))
 
 TEST(APITestBasicMutation) {
   v8::Isolate* v8_isolate = CcTest::isolate();