Revert of Limit the usage of SharedPersistent to ScriptValue only

Revert of Limit the usage of SharedPersistent to ScriptValue only (https://codereview.chromium.org/146523002/)

Reason for revert:
This change seems to be causing failures with plugins on windows 7 build:

http://build.chromium.org/p/chromium.webkit/builders/Win7%20%28dbg%29/builds/13319

The blame is 165731:165767 so this change looks most likely.


Original issue's description:
> We've replaced SharedPersistent with ScopedPersistent or ScriptValue before, but a couple of SharedPersistents are remaining. So this CL replaces them.
> 
> Ideally we want to remove SharedPersistent though.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165751

TBR=jochen@chromium.org,dcarney@chromium.org,haraken@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165802

[Alpha Left Google, 2014-01-25 00:35:32]

Created Revert of Limit the usage of SharedPersistent to ScriptValue only

[commit-bot: I haz the power, 2014-01-25 00:35:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/147333004/1

[commit-bot: I haz the power, 2014-01-25 00:36:06]

Change committed as 165802

[Alpha Left Google, 2014-01-25 02:12:47]

On 2014/01/25 00:36:06, I haz the power (commit-bot) wrote:
> Change committed as 165802

Reverting this change did clear the failures on interactive_ui_tests.

[haraken, 2014-01-25 14:20:19]

On 2014/01/25 02:12:47, Alpha wrote:
> On 2014/01/25 00:36:06, I haz the power (commit-bot) wrote:
> > Change committed as 165802
> 
> Reverting this change did clear the failures on interactive_ui_tests.

Sorry about the breakage, and thanks for the revert. I'll investigate.