Manual path slash normalization in ExpandSpecial (windows ninja)
Manual path slash normalization in ExpandSpecial (windows ninja)

Not using os.path.normpath per comment and https://groups.google.com/group/gyp-developer/browse_thread/thread/a48db62b5776922a
Review URL: https://chromiumcodereview.appspot.com/9431025
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google