Fix undefined index notices in `comment/slashes` test cases. `wp_new_comment()` and `edit_comment()` expect more variables than were being passed.

See #25282.



git-svn-id: http://develop.svn.wordpress.org/trunk@25365 602fd350-edb4-49c9-b593-d223f7449a82
`get_home_url()` assumes `$GLOBALS['pagenow']` is set. It isn't in `Tests_URL`... and now it is.

See #25282.



git-svn-id: http://develop.svn.wordpress.org/trunk@25366 602fd350-edb4-49c9-b593-d223f7449a82
Suppress deprecated notices for `wp_shrink_dimensions()`.

See #25282.



git-svn-id: http://develop.svn.wordpress.org/trunk@25367 602fd350-edb4-49c9-b593-d223f7449a82
Pass `$args` as an array, rather than a splat, to `wp_clear_scheduled_hook()`. There are comments in the code describing the deprecated argument behavior.

See #25282.



git-svn-id: http://develop.svn.wordpress.org/trunk@25368 602fd350-edb4-49c9-b593-d223f7449a82