tree 494ef06ac77d6b2ca4ba7005d9029e5b68e40527
parent df802ee68d7d4913bbf4ce652071e1f18adce423
author Urvang Joshi <urvang@google.com> 1541528855 -0800
committer Urvang Joshi <urvang@google.com> 1541626029 -0800

Remove LAST_REF_FRAMES enum value.

It's clearer to use LAST3_FRAME directly instead.

Also, some related cleanup / comments.

BUG=aomedia:2230

Change-Id: I11a0520fdea31f88b756e44d4a873885a6a0e370