Moved zones and zone related stuff in its own directory.

test/cctest/test-ast.cc

Index: test/cctest/test-ast.cc
diff --git a/test/cctest/test-ast.cc b/test/cctest/test-ast.cc
index c2cc89828e71f3393d48658e31722cc80f533e6b..85f952098cdc8826605ac889c5952b91e64f954c 100644
--- a/test/cctest/test-ast.cc
+++ b/test/cctest/test-ast.cc
@@ -38,7 +38,7 @@ TEST(List) {
   List<AstNode*>* list = new List<AstNode*>(0);
   CHECK_EQ(0, list->length());
 
-  v8::base::AccountingAllocator allocator;
+  v8::internal::AccountingAllocator allocator;
   Zone zone(&allocator);
   AstValueFactory value_factory(&zone, 0);
   AstNodeFactory factory(&value_factory);