Subresults logged after Simpletest.finish() are now causing failures in mochitest

Yesterday, finally the patch for bug 1032878 went in. This makes mochitests fail when subresults are being reported after SimpleTest.finish() has been called. It took quite a while, because I had to fix all the test failures beforehand, that were happening with this patch applied. After the fix went in, it caused 2 new failures that weren't caught by my tryserver runs. Luckily, it was easy to fix those.