deleteDatabase() success should be IDBVersionChangeEvent [Tests]

deleteDatabase() success should be IDBVersionChangeEvent [Tests]

New tests only. Originally reviewed as part of crrev.com/235493003
but split out for a 3-part landing (blink, chromium, tests).

TBR=dgrogan@chromium.org,cmumford@chromium.org
BUG=362251
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171507

[jsbell, 2014-04-14 16:41:21]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2014-04-14 16:41:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jsbell@chromium.org/235933010/1

[commit-bot: I haz the power, 2014-04-14 17:06:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-14 17:06:39]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[jsbell, 2014-04-14 18:23:51]

The CQ bit was checked by jsbell@chromium.org

[commit-bot: I haz the power, 2014-04-14 18:24:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jsbell@chromium.org/235933010/20001

[commit-bot: I haz the power, 2014-04-14 19:30:32]

Change committed as 171507