Several mathml/ DRT tests fail.
Some tests have no expected files, other just fail.
These tests were introduced during 8u112 Webkit merge, and are not present in older DRT workspace.

Affected tests:
mathml/mathml-in-dashboard.html
mathml/opentype/horizontal-munderover.html
mathml/opentype/horizontal.html
mathml/opentype/large-operators.html
mathml/opentype/opentype-stretchy-horizontal.html
mathml/opentype/opentype-stretchy.html
mathml/opentype/vertical.html
mathml/presentation/foreign-element-in-token.html
mathml/presentation/stretchy-depth-height.html