Revert "clean up after big refactor of SkColorFilter --> ...Base"

This reverts commit 6dc67b15384f4b496e59467a84e2a997567ce1e2.

Reason for revert: tripping up asan

Original change's description:
> clean up after big refactor of SkColorFilter --> ...Base
> 
> Change-Id: I67ba7db1a1e4e0c8deb5299a6580a669cc08f38c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299056
> Reviewed-by: John Stiles <johnstiles@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=reed@google.com,johnstiles@google.com

Change-Id: Id157fed27d517a33ae235307247ab57dc605eac6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/298979
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
6 files changed