Revert of Change base::Value::ListStorage to std::vector<base::Value>

headless/public/internal/value_conversions.h

Index: headless/public/internal/value_conversions.h
diff --git a/headless/public/internal/value_conversions.h b/headless/public/internal/value_conversions.h
index f2ded264939175d8114f5229eec150329f5c307c..5622fb84773506f0a628a0709fc1d38b12900ea2 100644
--- a/headless/public/internal/value_conversions.h
+++ b/headless/public/internal/value_conversions.h
@@ -151,7 +151,7 @@
     }
     errors->Push();
     for (const auto& item : *list)
-      result.push_back(FromValue<T>::Parse(item, errors));
+      result.push_back(FromValue<T>::Parse(*item, errors));
     errors->Pop();
     return result;
   }