Revert "Add DSL PossibleExpression & PossibleStatement"

This reverts commit d42932a1b5b19098961b4837d54f75a52f278817.

Reason for revert: Breaking CMake and SKQP builds.

Original change's description:
> Add DSL PossibleExpression & PossibleStatement
> These are currently unused, but in future CLs they will be used to
> capture line number information in DSL error handling.
> Change-Id: Ieee730e0ad8323043437972fedb5bec471c367e4
> Reviewed-on:
> Reviewed-by: John Stiles <>,,

Change-Id: I2062c9964569c9129a2145f9e45f849310129687
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-by: Florin Malita <>
Commit-Queue: Florin Malita <>
9 files changed