Error in compound cache-control header.

A cache control header containing both no-cache and max-age attribute does not
behave as expected.

Cache-Control: no-cache, max-age=200000

Will set expired to 20000ms seconds, ignoring the no-cache header. My
interpretation is that the no-cache header should not be ignored in
this case.

Change-Id: Iadd1900e4d2c6c0dacc6bb3e7b944cf78ca9b266