Improve EncodePOSIXShellArgument to catch more weird characters.
Improve EncodePOSIXShellArgument to catch more weird characters.

old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google