Make private symbols non-enumerable

Make private symbols non-enumerable

Methods in the runtime that enumerate over properties should never deal with private symbols. Most commonly such methods only loop over enumerable properties. This fix avoids accidentally handling private symbols in methods that only deal with enumerable properties. Methods that need to look at non-enumerable properties as well still have to manually filter private symbols (e.g., the KeyAccumulator).

BUG=chromium:664411
Committed: https://crrev.com/135b9f9360342089de151990a7bf61c31caa6f1f
Cr-Commit-Position: refs/heads/master@{#40932}

[Toon Verwaest, 2016-11-11 11:07:01]

verwaest@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Toon Verwaest, 2016-11-11 11:07:02]

ptal

[Jakob Kummerow, 2016-11-11 14:31:37]

lgtm

[Toon Verwaest, 2016-11-11 14:37:55]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2016-11-11 14:37:59]

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, 2016-11-11 15:05:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:31:01]

Description was changed from

==========
Make private symbols non-enumerable

Methods in the runtime that enumerate over properties should never deal with
private symbols. Most commonly such methods only loop over enumerable
properties. This fix avoids accidentally handling private symbols in methods
that only deal with enumerable properties. Methods that need to look at
non-enumerable properties as well still have to manually filter private symbols
(e.g., the KeyAccumulator).

BUG=chromium:664411
==========

to

==========
Make private symbols non-enumerable

Methods in the runtime that enumerate over properties should never deal with
private symbols. Most commonly such methods only loop over enumerable
properties. This fix avoids accidentally handling private symbols in methods
that only deal with enumerable properties. Methods that need to look at
non-enumerable properties as well still have to manually filter private symbols
(e.g., the KeyAccumulator).

BUG=chromium:664411

Committed: https://crrev.com/135b9f9360342089de151990a7bf61c31caa6f1f
Cr-Commit-Position: refs/heads/master@{#40932}
==========

[commit-bot: I haz the power, 2016-11-17 22:31:02]

Patchset 1 (id:??) landed as
https://crrev.com/135b9f9360342089de151990a7bf61c31caa6f1f
Cr-Commit-Position: refs/heads/master@{#40932}