Revert "Switched SkSL parser APIs from char* + length to string_view"

This reverts commit 2705cbf9bd1d66065654fb6a69396003e63687d7.

Reason for revert: blocking g3 autoroller

Original change's description:
> Switched SkSL parser APIs from char* + length to string_view
>
> Change-Id: I9f4378b622699d80bef449f9857117e9cc437956
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/418140
> Reviewed-by: Brian Osman <brianosman@google.com>
> Reviewed-by: John Stiles <johnstiles@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Commit-Queue: John Stiles <johnstiles@google.com>

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

Change-Id: I56fe1b306f2619227b8a2c10b3ab7de30de60bdf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/418536
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
10 files changed