Revert of Reenable disabled component extensions with profile resetter.

Revert of Reenable disabled component extensions with profile resetter. (patchset #6 id:100001 of https://codereview.chromium.org/2647783003/ )

Reason for revert:
It didn't work as expected, so removing dead code.

Original issue's description:
> Reenable disabled component extensions with profile resetter.
> 
> Sice disabled extensions are synced and component extensions do not
> have a UI for reenabling them, once disabled will stay disabled forever.
> 
> It happened that for some reason some component extensions were
> disabled. The reason is unknown, but at least users will be able to
> recover from this situation by using the profile resetter.
> 
> Note, that we allow to disable component extensions programatically,
> which was used at least for the Hotword component extension.
> 
> TEST=Disable a component extension programatically, then reset the
>      profile in chrome://settings.
> BUG=680429
> 
> Review-Url: https://codereview.chromium.org/2647783003
> Cr-Commit-Position: refs/heads/master@{#446575}
> Committed: https://chromium.googlesource.com/chromium/src/+/622f70d2786a5dd446c45fa8222ce2d14d98cbf5

TBR=battre@chromium.org,lazyboy@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=680429

[mtomasz, 2017-07-10 08:54:29]

The CQ bit was checked by mtomasz@chromium.org

[mtomasz, 2017-07-10 08:54:29]

Created Revert of Reenable disabled component extensions with profile resetter.

[commit-bot: I haz the power, 2017-07-10 08:54:41]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-07-10 08:57:11]

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

[commit-bot: I haz the power, 2017-07-10 08:57:12]

Try jobs failed on following builders:
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)