Add suppression: JSON-strigify.html test is keeping DEPS bot failing.
Add suppression: JSON-strigify.html test is keeping DEPS bot failing.

TBR=cbiesinger
BUG=14885
BUG=306929

Review URL: https://codereview.chromium.org/189363004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@168702 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs