Revert of "[es6] Partially implement Reflect.ownKeys."

Revert of "[es6] Partially implement Reflect.ownKeys."

Reason for revert: failed tests on a Windows build.

TBR=rossberg,cbruni,neis
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/ec0f891d1ee31a6c22217dbb80db33ebff87f618
Cr-Commit-Position: refs/heads/master@{#31907}

[neis, 2015-11-10 00:04:52]

The CQ bit was checked by neis@chromium.org

[commit-bot: I haz the power, 2015-11-10 00:05:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1426943007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1426943007/1

[commit-bot: I haz the power, 2015-11-10 00:05:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 00:05:29]

Patchset 1 (id:??) landed as
https://crrev.com/ec0f891d1ee31a6c22217dbb80db33ebff87f618
Cr-Commit-Position: refs/heads/master@{#31907}