Revert of Have GrRectBlurEffect use Linear filtering (rather than Nearest Neighbor) (patchset #2 id:20001 of https://codereview.chromium.org/1378023004/ )

Reason for revert:
Trial run confirmed layout test expectations - will reland after suppressions

Original issue's description:
> Have GrRectBlurEffect use Linear filtering (rather than Nearest Neighbor)
>
> Committed: https://skia.googlesource.com/skia/+/2d70bcccc9ba8f3898a7ae506ba7410ed8e9c9db
>
> Committed: https://skia.googlesource.com/skia/+/5175b9563055926b4969d57f06e4ae49b86e055b

TBR=bsalomon@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1378813004
2 files changed