storage/indexeddb/basics-workers.html has been pretty crashy on XP since circa r106400. CHECK(index < GetInternalFieldCount() && index >= 0) failed Historical runs: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=storage%2Findexeddb%2Fbasics-workers.html
Created attachment 125847 [details] Patch
Filed http://crbug.com/113063
Hasn't crashed recently - still an issue?