Remove a flaky entry for form-submit-aborts-parsing.html.
Remove a flaky entry for form-submit-aborts-parsing.html.

The test is not flaky now.
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast/loader/form-submit-aborts-parsing.html

BUG=520178
TBR=dominicc@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1528013005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365414}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk