Revert "transition matrix44 to opt-in only"

This reverts commit 0f1f87d7bd4b04b33cabab33622d5a1b75efec2b.

Reason for revert: google3 and flutter also need the guard

Original change's description:
> transition matrix44 to opt-in only
> 
> In service of https://chromium-review.googlesource.com/c/chromium/src/+/2067862/
> 
> Change-Id: Ib6fd24c16c295fb4211dc295268af1e6f7f3fc45
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/283661
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=fmalita@chromium.org,reed@google.com

Change-Id: I7c8cf2bc67aa267d442d0ca663e8378aa8feb409
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/283896
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
5 files changed