Revert of Add suppression: JSON-strigify.html test is keeping DEPS bot failing. (https://codereview.chromium.org/189363004/)

Reason for revert:
Sorry, I misunderstood the DEPS bot. Looks like this is just because the fix hasn't gotten through the blink rolls.

Original issue's description:
> Add suppression: JSON-strigify.html test is keeping DEPS bot failing.
> 
> TBR=cbiesinger
> BUG=14885
> BUG=306929
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168702

TBR=cbiesinger@chromium.org,cbiesinger@google.com
NOTREECHECKS=true
NOTRY=true
BUG=14885

Review URL: https://codereview.chromium.org/190373002

git-svn-id: svn://svn.chromium.org/blink/trunk@168715 bbb929c8-8fbe-4397-9dbb-9b2b20218538