Revert "Avoid crash in Viewer when viewing shaders in Graphite."

This reverts commit fbc1b1ee10847988dadde224bd57fb1208c72d93.

Reason for revert: As discussed in chat, reverting due to breaking bazel viewer build.

Original change's description:
> Avoid crash in Viewer when viewing shaders in Graphite.
>
> Viewing shaders isn't working properly yet, but we no longer crash.
>
> Bug: skia:14418
> Change-Id: I3f351dae9bd2aab84db50b213acecc01d49f8700
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/719017
> Reviewed-by: Brian Osman <brianosman@google.com>
> Auto-Submit: John Stiles <johnstiles@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

Bug: skia:14418
Change-Id: I790e4577df1b345ecaaf17d1f61f10c98d07eb6e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/720856
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Dominik Röttsches <drott@google.com>
5 files changed