This deletes the previous hand-built drivers and the
distinction between a debug and non-debug driver.
Bug: skia:
Change-Id: Ia733783d703da803f76361c61b938d9ce70c88f0
Reviewed-on: https://skia-review.googlesource.com/150163
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
