Revert of Removed the ScriptedSpeech content side.

Revert of Removed the ScriptedSpeech content side. (patchset #2 id:20001 of https://codereview.chromium.org/598923002/)

Reason for revert:
I'm sorry, the ENABLE_SPEECH_RECOGNITION switch is still used in the Chrome on
Android repo. I don't see (on the short term) another way of handling this than
not removing that switch. I'm going to revert this change.

Original issue's description:
> Removed the ScriptedSpeech content side.
>
> Removal the corresponding changes in blink are applied in the following patch
> https://codereview.chromium.org/599863002/
>
> BUG=402536
>
> Committed: https://crrev.com/6b8dda12a7d842517c5c4ee155cf48951e908a7f
> Cr-Commit-Position: refs/heads/master@{#296655}

TBR=avi@chromium.org,mohan.reddy@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=402536
Committed: https://crrev.com/5affd816675a57698f20260c6af0a894d7d4e9c8
Cr-Commit-Position: refs/heads/master@{#296692}

[Michael van Ouwerkerk, 2014-09-25 11:33:12]

Created Revert of Removed the ScriptedSpeech content side.

[commit-bot: I haz the power, 2014-09-25 11:33:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/602083002/1

[commit-bot: I haz the power, 2014-09-25 11:34:23]

Committed patchset #1 (id:1) as 02a4902d35e9fb9109c8bea588bf951f4b0d1ecb

[commit-bot: I haz the power, 2014-09-25 11:35:06]

Patchset 1 (id:??) landed as
https://crrev.com/5affd816675a57698f20260c6af0a894d7d4e9c8
Cr-Commit-Position: refs/heads/master@{#296692}

[Avi (use Gerrit), 2014-09-25 15:32:08]

On 2014/09/25 11:35:06, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/5affd816675a57698f20260c6af0a894d7d4e9c8
> Cr-Commit-Position: refs/heads/master@{#296692}

Please coordinate with the Blink team. Either we do or we don't need this
switch, and I'd rather get this settled by discussion than reverts.

[MRV, 2014-09-26 02:48:29]

On 2014/09/25 15:32:08, Avi wrote:
> On 2014/09/25 11:35:06, I haz the power (commit-bot) wrote:
> > Patchset 1 (id:??) landed as
> > https://crrev.com/5affd816675a57698f20260c6af0a894d7d4e9c8
> > Cr-Commit-Position: refs/heads/master@{#296692}
> 
> Please coordinate with the Blink team. Either we do or we don't need this
> switch, and I'd rather get this settled by discussion than reverts.

Dear Mr.avi, thanks for feedback.
I'll definatly co-ordinate with blink team first, while making any changes to
interfaces.