Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  04377b5cac8d5f69def4bc9f545e8b804a5921e6

Organise Flat/ElementLinearData methods and tests

Move containsElementData to FlatLinearData next to isElementData. Move
tests for both methods to FlatLinearData.test.js.

Change-Id: I07a192f5925da7cc763efe5e41427f1f47d85850