[ios] Use square brackets syntax for nulling out toJSON property.

[ios] Use square brackets syntax for nulling out toJSON property.

Closure reports an error for the old code:

../../ios/web/web_state/js/resources/common.js:40: ERROR - assignment to
property toJSON of __gCrWeb.common.JSONSafeObject.prototype
found   : null
required: function (this:Object, string=): *
  __gCrWeb.common.JSONSafeObject.prototype.toJSON = null;
  ^

BUG=None

Committed: https://crrev.com/02176404cf7da8bc6bdc4650285419d5de0e7f5a
Cr-Commit-Position: refs/heads/master@{#429702}

[Eugene But (OOO till 7-30), 2016-11-03 16:44:01]

The CQ bit was checked by eugenebut@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-03 16:44:50]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Eugene But (OOO till 7-30), 2016-11-03 16:49:05]

eugenebut@chromium.org changed reviewers:
+ baxley@chromium.org

[commit-bot: I haz the power, 2016-11-03 16:53:40]

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

[commit-bot: I haz the power, 2016-11-03 16:53:41]

Dry run: This issue passed the CQ dry run.

[baxley, 2016-11-03 19:51:10]

lgtm

[Eugene But (OOO till 7-30), 2016-11-03 21:33:39]

The CQ bit was checked by eugenebut@chromium.org

[commit-bot: I haz the power, 2016-11-03 21:34:28]

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, 2016-11-03 21:40:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-03 21:44:14]

Description was changed from

==========
[ios] Use square brackets syntax for nulling out toJSON property.

Closure reports an error for the old code:

../../ios/web/web_state/js/resources/common.js:40: ERROR - assignment to
property toJSON of __gCrWeb.common.JSONSafeObject.prototype
found   : null
required: function (this:Object, string=): *
  __gCrWeb.common.JSONSafeObject.prototype.toJSON = null;
  ^

BUG=None
==========

to

==========
[ios] Use square brackets syntax for nulling out toJSON property.

Closure reports an error for the old code:

../../ios/web/web_state/js/resources/common.js:40: ERROR - assignment to
property toJSON of __gCrWeb.common.JSONSafeObject.prototype
found   : null
required: function (this:Object, string=): *
  __gCrWeb.common.JSONSafeObject.prototype.toJSON = null;
  ^

BUG=None

Committed: https://crrev.com/02176404cf7da8bc6bdc4650285419d5de0e7f5a
Cr-Commit-Position: refs/heads/master@{#429702}
==========

[commit-bot: I haz the power, 2016-11-03 21:44:14]

Patchset 1 (id:??) landed as
https://crrev.com/02176404cf7da8bc6bdc4650285419d5de0e7f5a
Cr-Commit-Position: refs/heads/master@{#429702}