Bug 927349 part 29 - Disable failing browser_555547.js on Windows opt - pushed again without backing out parts 22-29 at the same time; r=me

In https://hg.mozilla.org/integration/mozilla-inbound/rev/3ab2ff9b9f94
I accidentally pushed part 29 along with a backout for parts 22-29. This patch
reverts that change.

If this changset causes problems, the following changesets should be backed out:

https://hg.mozilla.org/integration/mozilla-inbound/rev/477f46897b0b
https://hg.mozilla.org/integration/mozilla-inbound/rev/6c345954bce5
https://hg.mozilla.org/integration/mozilla-inbound/rev/642e400b22a9
https://hg.mozilla.org/integration/mozilla-inbound/rev/9bdf7c2279fa
https://hg.mozilla.org/integration/mozilla-inbound/rev/79cac8c71159
https://hg.mozilla.org/integration/mozilla-inbound/rev/cfe757e478d5
https://hg.mozilla.org/integration/mozilla-inbound/rev/eaf834051cbd