Remove ScopedVector from tools/gn/.

tools/gn/function_get_target_outputs.cc

Index: tools/gn/function_get_target_outputs.cc
diff --git a/tools/gn/function_get_target_outputs.cc b/tools/gn/function_get_target_outputs.cc
index bec825f8708b51b3501d627987b542624810f045..e13e1e3a54651af5f5a541cdde3b7b3a0856fb02 100644
--- a/tools/gn/function_get_target_outputs.cc
+++ b/tools/gn/function_get_target_outputs.cc
@@ -93,7 +93,7 @@ Value RunGetTargetOutputs(Scope* scope,
     *err = Err(function, "No targets defined in this context.");
     return Value();
   }
-  for (auto* item : *collector) {
+  for (const auto& item : *collector) {
     if (item->label() != label)
       continue;