remove lots of legacy flags

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4209

Change-Id: I49ae36a9b2bb51a6470638d3264923ff4a4dea0a
Reviewed-on: https://skia-review.googlesource.com/4209
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
29 files changed