Revert "rm legacy flags for hinting enum"

This reverts commit 5cd242b4fc8fb926d1233bb4561c0607755c4e05.

Reason for revert: breaking google3

Original change's description:
> rm legacy flags for hinting enum
> 
> Bug: skia:
> Change-Id: I56ad33fa30aa8cec8a60cd70d4e4767defb923ca
> Reviewed-on: https://skia-review.googlesource.com/c/170105
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=reed@google.com

Change-Id: Iffa9b20d77455b4554aae132268af8a0cf252496
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/170270
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
4 files changed