re-enable simpleblurroundrect gm

BUG=skia:
R=caryclark@google.com
TBR=caryclark

Author: humper@google.com

Review URL: https://codereview.chromium.org/263823002

git-svn-id: http://skia.googlecode.com/svn/trunk@14498 2bbb7eff-a529-9590-31e7-b0007b416f81

expectations/gm/ignored-tests.txt

@@ -37,7 +37,3 @@
 # This change removes an API that this GM was testing. If/when it lands and sticks,
 # I will likely just delete the GM.
 canvas-layer-state
-
-# humper: https://codereview.chromium.org/248613004/
-# Changed the test in a few ways, will need rebaselining.
-simpleblurroundrect