GN: Replace vector<ParseNode*> with vector<unique_ptr<ParseNode>> in parse_tree.h.

tools/gn/function_foreach.cc

Index: tools/gn/function_foreach.cc
diff --git a/tools/gn/function_foreach.cc b/tools/gn/function_foreach.cc
index 549ebe407c1ec93287922ab29ecb5ab9c22baa54..b74fc186af115c95ad951c7bd2c5389ba6ce4697 100644
--- a/tools/gn/function_foreach.cc
+++ b/tools/gn/function_foreach.cc
@@ -47,7 +47,7 @@ Value RunForEach(Scope* scope,
                  const FunctionCallNode* function,
                  const ListNode* args_list,
                  Err* err) {
-  const std::vector<const ParseNode*>& args_vector = args_list->contents();
+  const auto& args_vector = args_list->contents();
   if (args_vector.size() != 2) {
     *err = Err(function, "Wrong number of arguments to foreach().",
                "Expecting exactly two.");
@@ -57,7 +57,8 @@ Value RunForEach(Scope* scope,
   // Extract the loop variable.
   const IdentifierNode* identifier = args_vector[0]->AsIdentifier();
   if (!identifier) {
-    *err = Err(args_vector[0], "Expected an identifier for the loop var.");
+    *err =
+        Err(args_vector[0].get(), "Expected an identifier for the loop var.");
     return Value();
   }
   base::StringPiece loop_var(identifier->value().value());
@@ -69,7 +70,7 @@ Value RunForEach(Scope* scope,
   if (list_identifier) {
     list_value = scope->GetValue(list_identifier->value().value(), true);
     if (!list_value) {
-      *err = Err(args_vector[1], "Undefined identifier.");
+      *err = Err(args_vector[1].get(), "Undefined identifier.");
       return Value();
     }
   } else {