Fix typing for IDBKeyRange per spec.
Fix typing for IDBKeyRange per spec.

https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBKeyRange

3.1.9

hippich/typescript,fdecampredon/jsx-typescript-old-version,fdecampredon/jsx-typescript-old-version,mbebenita/shumway.ts,mbebenita/shumway.ts,popravich/typescript,mbebenita/shumway.ts,popravich/typescript,hippich/typescript,hippich/typescript,popravich/typescript,fdecampredon/jsx-typescript-old-version