The last iteration of the patch for bug 754671 introduced the "removeFiles" method in the PageThumbsWorker. Unfortunately Storage.remove() relied on the old "removeFile" method and should now silently fail. The test I wrote for exactly this was wrong so we didn't catch that. I re-added the "removeFile" method to remove single files and fixed the test as well.

Comment on attachment 654032 [details] [diff] [review] patch v1 [Approval Request Comment] Bug caused by (feature/regressing bug #): bug 754671 User impact if declined: removing a site from history doesn't remove its thumbnails Testing completed (on m-c, etc.): should be in tomorrow's nightly Risk to taking this patch (and alternatives if risky): low risk, need it for bug 754671 on Aurora String or UUID changes made by this patch: none. We need this patch on Aurora as well in combination with the patch from bug 754671.

Comment on attachment 654032 [details] [diff] [review] patch v1 [Triage Comment] We're letting bug 754671 ride the trains, so no need to uplift to Aurora 16.

Bah, backed out because the test times out on Windows. Seems to be a file lock issue. https://hg.mozilla.org/integration/fx-team/rev/fd6973289931

Marking Fx 16 as unaffected because I fixed the backported patch from bug 754671 to just use "removeFiles" for now.

Ok, I found the failure. Try looks green now: https://tbpl.mozilla.org/?tree=Try&rev=b885539b32bb Going to clean the patch up and upload it.

Fixed the windows timeout and cleaned up the test. It was timing out on Windows because Windows sometimes locks the files and we need to re-try removing those files. The missing part was re-adding the URL to the browser history so that the history observer's onDeleteURI() is called again.