Fix always false condition and clean function body
Fix always false condition and clean function body

An always false condition was remove from Normalize member function of
FilePath and the body of the function which was poorly writen is
improved.

gianricardo/googletest,google/googletest,google/googletest,antidotcb/googletest,google/googletest,empiredan/googletest,gianricardo/googletest,antidotcb/googletest,empiredan/googletest,antidotcb/googletest,antidotcb/googletest,gianricardo/googletest,google/googletest,empiredan/googletest