Remove now obsolete workaround for old RapidJSON FindMember() API.
Remove now obsolete workaround for old RapidJSON FindMember() API.

dlyongemallo/libaddressinput,mcanthony/libaddressinput,parastoog/my-libaddressinput,dlyongemallo/libaddressinput,google/libaddressinput,mcanthony/libaddressinput,parastoog/my-libaddressinput,googlei18n/libaddressinput,roubert/libaddressinput,google/libaddressinput,googlei18n/libaddressinput,mcanthony/libaddressinput,roubert/libaddressinput,roubert/libaddressinput,parastoog/my-libaddressinput,google/libaddressinput,dlyongemallo/libaddressinput,googlei18n/libaddressinput