Thread decls-list through Declaration

src/ast/prettyprinter.cc

Index: src/ast/prettyprinter.cc
diff --git a/src/ast/prettyprinter.cc b/src/ast/prettyprinter.cc
index 19e9478da27a18f38fbbb7e6eb6279e84e873c8b..a3fc50ae571d8cfa9e434880e5b6b88c8c77b8cf 100644
--- a/src/ast/prettyprinter.cc
+++ b/src/ast/prettyprinter.cc
@@ -662,13 +662,10 @@ void AstPrinter::PrintOut(Isolate* isolate, AstNode* node) {
   PrintF("%s", printer.output_);
 }
 
-
-void AstPrinter::PrintDeclarations(ZoneList<Declaration*>* declarations) {
-  if (declarations->length() > 0) {
+void AstPrinter::PrintDeclarations(Declaration::List* declarations) {
+  if (!declarations->is_empty()) {
     IndentedScope indent(this, "DECLS");
-    for (int i = 0; i < declarations->length(); i++) {
-      Visit(declarations->at(i));
-    }
+    for (Declaration* decl : *declarations) Visit(decl);
   }
 }