[Chromium] storage/indexeddb tests sometimes timeout
https://bugs.webkit.org/show_bug.cgi?id=65862

Reviewed by Ojan Vafai.

storage/indexeddb/index-cursor.html was taking up to 26 seconds on some debug configurations
due to the large amount of output. Tweak the test to reduce the spam. On my test box this
drops the runtime of this single test from 7s to 2s.

* storage/indexeddb/index-cursor-expected.txt:
* storage/indexeddb/resources/index-cursor.js:
(cursorIteration):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@130334 268f45cc-cd09-0410-ab3c-d52691b4dbfc