The function that handles thumbnail size is already hooked with after_setup_theme in \twentythirteen\functions.php.
There is no use adding a if (!function_exists()) in child functions.php because the child functions.php is always loaded before. So this would be more logical to find this in the parent file.
The answer would be to set a different prority to your child function like :
add_action('after_setup_theme', 'watercolor_setup', 11);
But as you mentioned this does not work in your case. This makes me to perplex because it should override size. I guess you’ll have to code it in each template you want to modify in your child theme:
the_post_thumbnail(array(604,310));
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