[AttrBuilder] Remove ctor accepting AttributeList and Index

Use the AttributeSet constructor instead. There's no good reason
why AttrBuilder itself should exact the AttributeSet from the
AttributeList. Moving this out of the AttrBuilder generally results
in cleaner code.

GitOrigin-RevId: c63a3175c2947e8c1a2d3bbe16a8586600705c54
1 file changed