Revert "Fixed an issue with sksl variable declarations"

This reverts commit 88bd8edcff23dc9cf31b664cba7ba73b235318b0.

Reason for revert: unhappy bots

Original change's description:
> Fixed an issue with sksl variable declarations
> 
> There was an issue where multiple variables defined in the same
> declaration were not being sequenced appropriately during analysis, so
> 'int x = 0, y = x + 1' would report that x was undefined.
> 
> Bug: skia:
> Change-Id: I882f7e216467306f6a6013a0a34aac30a4c60744
> Reviewed-on: https://skia-review.googlesource.com/18313
> Reviewed-by: Chris Dalton <csmartdalton@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> 

TBR=csmartdalton@google.com,ethannicholas@google.com
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Change-Id: Ibc68674289dce70b6173a347a0e78bb0f1e6db1b
Reviewed-on: https://skia-review.googlesource.com/18457
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
9 files changed