[Chromium] Flaky layout test LayoutTests/svg/hixie/error/012.xml

[Chromium] Flaky layout test LayoutTests/svg/hixie/error/012.xml
https://bugs.webkit.org/show_bug.cgi?id=84082

Unreviewed Chromium test expectations update.

Results look right but the test maybe flaky.

* platform/chromium-mac-leopard/svg/hixie/error/012-expected.png:
* platform/chromium-mac-leopard/svg/hixie/error/012-expected.txt: Removed.
* platform/chromium-mac-snowleopard/svg/hixie/error/012-expected.png:
* platform/chromium-mac/svg/hixie/error/012-expected.png: Added.
* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114300 268f45cc-cd09-0410-ab3c-d52691b4dbfc