Fixed for pre-C++11 ifstream which does not accept std::string.
Fixed for pre-C++11 ifstream which does not accept std::string.

google/protobuf,Livefyre/protobuf,Livefyre/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf