Widen some flaky TestExpectations

These tests are flaky on Windows as well as other platforms.

TBR=ojan

Review URL: https://codereview.chromium.org/23902036

git-svn-id: svn://svn.chromium.org/blink/trunk@157860 bbb929c8-8fbe-4397-9dbb-9b2b20218538