Revert "added support for sk_Dimensions to SkSL"

This reverts commit 9335c28e40d780b4d1920b6c442234e2e833f93b.

Reason for revert: breaking vulkan and maybe metal in gold

Original change's description:
> added support for sk_Dimensions to SkSL
> 
> Bug: skia:
> Change-Id: I5f6a9941822b7b4a3ad85b22b1bcd31d58320f90
> Reviewed-on: https://skia-review.googlesource.com/146640
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=bsalomon@google.com,ethannicholas@google.com

Change-Id: I5e9dcfffd118ef125afb7b7792f16cb51dd779a3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/148680
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
23 files changed