Revert "use GrFPArgs for maskfilters"

This reverts commit a99b39399522658d7e5ddee97d0e45aa9fceaf89.

Reason for revert: try to unblock android roller

Original change's description:
> use GrFPArgs for maskfilters
> 
> Bug: skia:
> Change-Id: I8516a3b0f6d8301c51f0861c65b9fe8f692fc5e5
> Reviewed-on: https://skia-review.googlesource.com/97260
> Commit-Queue: Mike Reed <reed@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,reed@google.com

Change-Id: Iefe8ed19bba75df86173dec53f5ed4f1ea8724d0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/97581
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
6 files changed