[IndexedDB-tests] Review support.js files in IndexedDB/ and subdirectories (#461)

Combine the functions so that #63, #66 ~ #69 can remove the file.

Still keep IndexedDB/support.js use vendor prefix.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/461

Received on Monday, 9 December 2013 07:21:54 UTC