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

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 02ca2c74c105b2a70ce87f7a809d42ef22fcc53f..e683bf21c735f0f82923099c634e6da499ad9b26 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -1119,7 +1119,7 @@ Handle<String> Literal::ToString() {
   if (value_->IsString()) return value_->AsString()->string();
   DCHECK(value_->IsNumber());
   char arr[100];
-  Vector<char> buffer(arr, ARRAY_SIZE(arr));
+  Vector<char> buffer(arr, arraysize(arr));
   const char* str;
   if (value()->IsSmi()) {
     // Optimization only, the heap number case would subsume this.