plugins/plugin-clip-subframe.html is flaky
https://bugs.webkit.org/show_bug.cgi?id=112324

Patch by John Bauman <jbauman@chromium.org> on 2013-03-14
Reviewed by Ryosuke Niwa.

Ignore duplicate SetWindow calls with identical arguments. Plugins
will ignore these so they're not a problem, and they can cause
flakiness on mac-wk2.

* platform/chromium-linux/plugins/plugin-clip-subframe-expected.txt:
* platform/chromium-mac/plugins/plugin-clip-subframe-expected.txt:
* platform/chromium-win/plugins/plugin-clip-subframe-expected.txt:
* platform/mac-wk2/plugins/plugin-clip-subframe-expected.txt:
* platform/mac/plugins/plugin-clip-subframe-expected.txt:
* plugins/plugin-clip-subframe-expected.txt:
* plugins/resources/plugin-clip-subframe-iframe.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145868 268f45cc-cd09-0410-ab3c-d52691b4dbfc