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

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
diff --git a/test/cctest/test-debug.cc b/test/cctest/test-debug.cc
index 433190750461998d204148f95f4092312ae638b1..c98d480a44c489bec5098e9eaefad72396465237 100644
--- a/test/cctest/test-debug.cc
+++ b/test/cctest/test-debug.cc
@@ -4154,7 +4154,7 @@ TEST(DebugBreak) {
 
   // Call all functions with different argument count.
   break_point_hit_count = 0;
-  for (unsigned int i = 0; i < ARRAY_SIZE(argv); i++) {
+  for (unsigned int i = 0; i < arraysize(argv); i++) {
     f0->Call(env->Global(), i, argv);
     f1->Call(env->Global(), i, argv);
     f2->Call(env->Global(), i, argv);
@@ -4162,7 +4162,7 @@ TEST(DebugBreak) {
   }
 
   // One break for each function called.
-  CHECK_EQ(4 * ARRAY_SIZE(argv), break_point_hit_count);
+  CHECK_EQ(4 * arraysize(argv), break_point_hit_count);
 
   // Get rid of the debug event listener.
   v8::Debug::SetDebugEventListener(NULL);