message: TestHeaderMapImplBase: avoid virtual call during construction
diff: @@ -648,7 +648,7 @@ public:
  TestHeaderMapImplBase() = default;
  TestHeaderMapImplBase(const std::initializer_list<std::pair<std::string, std::string>>& values) {
  for (auto& value : values) {
  - addCopy(value.first, value.second);
  + header_map_.addCopy(LowerCaseString(value.first), value.second);
  }
  }
  TestHeaderMapImplBase(const TestHeaderMapImplBase& rhs)
  