When passed a GD resource as `$image`, `wp_save_image_file()` should throw a deprecated argument notice:
{{{
Function wp_save_image_file was called with an argument that is deprecated since version 3.5.0!
$image needs to be a WP_Image_Editor object.
}}}
The test verifies that the notice is thrown as expected.
Includes:
* Removing the `Tests_Functions_Deprecated` class. It appears to be initially intended for testing deprecated functions or arguments, but this was later superseded by the `@expectedDeprecated` annotation.
* Removing a redundant test for `wp_save_image_file()` **not** throwing a deprecation notice when passed a `WP_Image_Editor` instance. This is already covered by `test_wp_save_image_file()`, which would fail if there is an unexpected deprecation notice.
Follow-up to [1061/tests], [25408], [25409], [53529].
See #56793.
git-svn-id: https://develop.svn.wordpress.org/trunk@55066 602fd350-edb4-49c9-b593-d223f7449a82
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