inspector/debugger/debug-inlined-scripts.html has been timing out on Windows since it was added in r78808. See the URL for an example of the failure.
<rdar://problem/9016972>
I believe this one is a subset of bug 54490. I can close this one as DUPLICATE if this is the case.
Yes, I think it is very likely a dupe. *** This bug has been marked as a duplicate of bug 54490 ***