Deleted testSporadicWrites IndexedDB performance test.

Deleted testSporadicWrites IndexedDB performance test.

These sporadic write tests introduced too much noise (too short a duration)
and were not a good measure of IndexedDB performance.

Note: This change will give the impression that IndexedDB performance has
improved when there was no actual improvement because we track the aggregate
test times.

BUG=367855, 369683
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278467

[jsbell, 2014-06-18 21:09:08]

lgtm

[Nico, 2014-06-18 21:10:29]

rslgtm

[cmumford, 2014-06-18 21:18:21]

+epenner for review of indexeddb_perf.py. -nednguyen1 because I mistakenly added
him thinking he could review indexeddb_perf.py.

[epenner, 2014-06-18 21:39:21]

On 2014/06/18 21:18:21, cmumford wrote:
> +epenner for review of indexeddb_perf.py. -nednguyen1 because I mistakenly
added
> him thinking he could review indexeddb_perf.py.

Lgtm.

[cmumford, 2014-06-19 16:40:29]

The CQ bit was checked by cmumford@chromium.org

[commit-bot: I haz the power, 2014-06-19 16:41:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cmumford@chromium.org/344683002/20001

[commit-bot: I haz the power, 2014-06-19 20:03:54]

Change committed as 278467