Adjust expectations and baselines for tests under fast/dom/

Rebaseline some tests that have different output under content_shell
than the did in DRT.

Also mark a test as Slow instead of Pass/Timeout.

BUG=111316,231908,231910
TBR=ojan

Review URL: https://codereview.chromium.org/20481002

git-svn-id: svn://svn.chromium.org/blink/trunk@154935 bbb929c8-8fbe-4397-9dbb-9b2b20218538