Change the name to reflect that it's a purely internal function.

The parent window for the richedit control on creation is the one that
receives notify messages, even after the parent has been changed using
SetParent.

d3d10: Forward ID3D10EffectVariable functions from ID3D10EffectConstantBuffer to ID3D10EffectVariable.

wined3d: Add a separate function for initializing the "contained_*" fields from the "changed" field.