Fix chromium completion

- fix wrong _alternative usage

src/_chromium

@@ -43,7 +43,7 @@ _arguments \
   "--proxy-pac-url=[Specify proxy autoconfiguration URL]:proxy autoconfiguration url:_urls" \
   "--password-store=[Set the password store to use]:password store: _wanted arguments expl 'wallet store' compadd -- basic gnome kwallet" \
   "--version[print version]" \
-       "*:: :{ _alternative _urls _files }"
+  '*:: :{ _alternative "urls\:url\:_urls" "file\:file\:_files" }'
 
 # excerpt from the chromium help message:
 #
@@ -209,3 +209,11 @@ _chromium_proxyurls () {
   fi
   return $ret
 }
+
+# Local Variables:
+# mode: Shell-Script
+# sh-indentation: 2
+# indent-tabs-mode: nil
+# sh-basic-offset: 2
+# End:
+# vim: ft=zsh sw=2 ts=2 et