* In [28481], `$admin_header_callback` and `$admin_image_div_callback` were set to `private` based on their erroneous `@param` value
* `$admin_header_callback` and `$admin_image_div_callback` are used as hook callbacks - as such, they must be `public`
* In [28521] and [28524], magic methods were added for back-compat
* Currently, there are 2 properties marked `private`, `$page` and `$updated` - `$page` is never used and `$updated` was added by me in [30186] during 4.1
Set `$admin_header_callback` and `$admin_image_div_callback` to `public`.
Remove the `$page` property - it duplicated the `$page` local var and is referenced/used nowhere.
Remove the magic methods - they were beyond overkill and rendered moot by the above changes.
See #30891.
git-svn-id: https://develop.svn.wordpress.org/trunk@31133 602fd350-edb4-49c9-b593-d223f7449a82
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