Follows-up b36d883.
By far most data providers are static (and PHPUnit expects them
to be static and calls them that way).
Most of these classes already had their data providers static
but additional commits sloppily introduced non-static ones.
* ResourceLoaderWikiModuleTest, 8968d8787f.
* TitleTest, 545f1d3a73.
Odd unused method 'dataTestIsValidMoveOperation' was introduced
in 550b878e63.
* GlobalVarConfigTest, a3e18c3670.
Change-Id: I5da99f7cd3da68c550ae507ffe1f725d31e7666f
In most cases, we just check whether the pages exist before saying
the module is not empty to avoid generating cached HTML without
the appropriate <script> or <link> tags.
However, for modules in the 'user' group, normal users cannot
delete their personal JavaScript/CSS pages, causing needless
extra requests, even though we know the pages are empty.
ResourceLoader::isKnownEmpty() now checks the page_len field
for modules in the 'user' group to check that there is
some actual content.
Bug: 68488
Change-Id: I0570f62887fd4642fd60367ae0b51d7dc19488ca
