Adjust test expectations.

- write-while-waiting.html was fixed by r175127.
- Tighten terminate-during-sync-operation-*.html expectations

BUG=357427
TBR=sigbjornf@opera.com

Review URL: https://codereview.chromium.org/308673008

git-svn-id: svn://svn.chromium.org/blink/trunk@175234 bbb929c8-8fbe-4397-9dbb-9b2b20218538