Revert "Stage sloppy block-scoped functions (Annex B 3.3)"

Revert "Stage sloppy block-scoped functions (Annex B 3.3)"

The current implemention breaks sloppy mode code that uses function
declarations inside blocks at top-level. Work is ongoing on a patch
to fix this issue, but in the meantime it seems reasonable to move
the feature out of staging.

Manual revert of commit 6e07f5a75ba2c949ac96efabd5248c76b9957112.

R=littledan@chromium.org
BUG=chromium:535836
LOG=y

Committed: https://crrev.com/bab3b5508280e7a58720f701f9dbec96f81a16d8
Cr-Commit-Position: refs/heads/master@{#31029}

[Dan Ehrenberg, 2015-09-30 18:53:08]

The CQ bit was checked by littledan@chromium.org

[Dan Ehrenberg, 2015-09-30 18:53:08]

lgtm

[commit-bot: I haz the power, 2015-09-30 18:53:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375213005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375213005/1

[commit-bot: I haz the power, 2015-09-30 19:17:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-30 19:17:54]

Patchset 1 (id:??) landed as
https://crrev.com/bab3b5508280e7a58720f701f9dbec96f81a16d8
Cr-Commit-Position: refs/heads/master@{#31029}