IndexedDB: Make test behavior deterministic in multiprocess ports
https://bugs.webkit.org/show_bug.cgi?id=111643

Reviewed by Tony Chang.

Root cause is documented in wkbug.com/111642 but as a stop-gap - ensure
that this test doesn't fail flakily in multiprocess ports by moving the
last part of the test out of a limbo zone.

* storage/indexeddb/resources/index-multientry.js: Run subsequent part of
test in open's "success" handler rather than transaction's "complete" handler.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145111 268f45cc-cd09-0410-ab3c-d52691b4dbfc