Revert "check for no blur and exit early"

This reverts commit 35a5e418b96053bbdebef2cceb33db995f960010.

Reason for revert: breaks google 3

Original change's description:
> check for no blur and exit early
> 
> Bug: skia:
> Change-Id: I98c07c5fd77ec67398dd4df12fb6a24aa4ca7731
> Reviewed-on: https://skia-review.googlesource.com/25567
> Commit-Queue: Mike Reed <reed@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Reviewed-by: Florin Malita <fmalita@chromium.org>

TBR=mtklein@chromium.org,mtklein@google.com,fmalita@chromium.org,reed@google.com

Change-Id: I9c4b50bb2fda504e5c61ed03c0722abff327ca72
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/25568
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
3 files changed