Temporary fix for flakiness dashboard by avoiding loading mac snow leopard test expectation file from WebKit

TBR=ojan

BUG=233075

Review URL: https://codereview.chromium.org/14301012

git-svn-id: svn://svn.chromium.org/blink/trunk@148620 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed