Remove the dependency of Zone on Isolate

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 096d5c788f9e03735f70461f9965793e794db3b0..227e49355b3f53e69d2940e34128817b586b2596 100644
--- a/test/cctest/test-ast.cc
+++ b/test/cctest/test-ast.cc
@@ -39,9 +39,9 @@ TEST(List) {
   CHECK_EQ(0, list->length());
 
   Isolate* isolate = CcTest::i_isolate();
-  Zone zone(isolate);
+  Zone zone;
   AstValueFactory value_factory(&zone, 0);
-  AstNodeFactory factory(&value_factory);
+  AstNodeFactory factory(isolate, &value_factory);
   AstNode* node = factory.NewEmptyStatement(RelocInfo::kNoPosition);
   list->Add(node);
   CHECK_EQ(1, list->length());