Revert "Use reference in range-for with non trivial type" #295
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/abseil-cpp/absl/time/internal/cctz/src/time_zone_info.cc:559:27: error: loop variable 'prefix' of type 'const std::string&' {aka 'const std::__cxx11::basic_string&'} binds to a temporary constructed from type 'const char* const' [-Werror=range-loop-construct]
559 | for (const std::string& prefix : prefixes) {