Revert "Add SkSL for-loop control flow test to dm."
Revert "Add SkSL for-loop control flow test to dm."

This reverts commit a0c266283a8ef230ad0436dbf885d2b616e7302b.

Reason for revert: failing on Mac Intel

Original change's description:
> Add SkSL for-loop control flow test to dm.
>
> While loops and do-while loops remain untested in dm, as they are not
> supported in ES2 (and therefore not available in Runtime Effects).
>
> Change-Id: I2f1bfccccd571cc4ced096bc18ebbb9ecc9f9b4a
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/359556
> Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Auto-Submit: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
> Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

TBR=brianosman@google.com,ethannicholas@google.com,f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com

Change-Id: I45335d16a695644eaeb8a535298c0efcc616c1ce
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/359840
Reviewed-by: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>

google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia