Revert of Factor out setIndexedDBClientCreateFunction from blink::initialize

Revert of Factor out setIndexedDBClientCreateFunction from blink::initialize (patchset #3 id:40001 of https://codereview.chromium.org/1823953002/ )

Reason for revert:
This caused threading race:

https://bugs.chromium.org/p/chromium/issues/detail?id=599011#c1


Original issue's description:
> Factor out setIndexedDBClientCreateFunction from blink::initialize
> 
> This CL moves setIndexedDBClientCreateFunction to WorkerContentSettingsClient's constructor
> and WebLocalFrame's constructor.
> 
> BUG=593269
> 
> Committed: https://crrev.com/3056d79df9ba4fe776a42455ebb1f495bd582ad2
> Cr-Commit-Position: refs/heads/master@{#382538}

TBR=sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=593269

[haraken, 2016-03-30 09:34:06]

Created Revert of Factor out setIndexedDBClientCreateFunction from
blink::initialize

[commit-bot: I haz the power, 2016-03-30 09:34:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1847513002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1847513002/1

[commit-bot: I haz the power, 2016-03-30 09:36:13]

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

[commit-bot: I haz the power, 2016-03-30 09:36:14]

Try jobs failed on following builders:
  ios_rel_device_gn on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_gn...)

[sof, 2016-04-07 11:20:17]

This revert failed to land; let me fix the underlying race instead.

[haraken, 2016-04-07 11:20:45]

On 2016/04/07 11:20:17, sof wrote:
> This revert failed to land; let me fix the underlying race instead.

ah, sorry, thanks!