Gardening: repaint tests need ImageOnlyFailure.
Gardening: repaint tests need ImageOnlyFailure.

These tests were marked Failure, but they fail on the image, not the text,
result. Changed to ImageOnlyFailure.

As a result, Chromium r309091 broke these tests on a number of bots.

TBR=bokan@chromium.org,cpu@chromium.org
BUG=438064
NOTRY=true

Review URL: https://codereview.chromium.org/814983003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187498 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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