[Devtools] Upgrade acorn services to use ECMAScript7

[Devtools] Upgrade acorn services to use ECMAScript7

Allows acorn to use ECMAScript7 for things like prettyprint.

R=lushnikov
BUG=667894
Committed: https://crrev.com/818678e082ef6f4de7dd31eacc0b2502d7263682
Cr-Commit-Position: refs/heads/master@{#437152}

[allada, 2016-12-08 00:06:47]

PTL

[lushnikov, 2016-12-08 00:21:04]

lgtm!

[lushnikov, 2016-12-08 00:21:09]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2016-12-08 00:21:51]

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, 2016-12-08 02:22:04]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481156469177170, "parent_rev":
"3f9e9b6dd4d9597d68eee115a6e76d4dc8177bb4", "commit_rev":
"1d55108b5ec96215c1d2b700821a2ac0c0afe90c"}

[commit-bot: I haz the power, 2016-12-08 02:22:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-08 02:25:34]

Description was changed from

==========
[Devtools] Upgrade acorn services to use ECMAScript7

Allows acorn to use ECMAScript7 for things like prettyprint.

R=lushnikov
BUG=667894
==========

to

==========
[Devtools] Upgrade acorn services to use ECMAScript7

Allows acorn to use ECMAScript7 for things like prettyprint.

R=lushnikov
BUG=667894

Committed: https://crrev.com/818678e082ef6f4de7dd31eacc0b2502d7263682
Cr-Commit-Position: refs/heads/master@{#437152}
==========

[commit-bot: I haz the power, 2016-12-08 02:25:34]

Patchset 1 (id:??) landed as
https://crrev.com/818678e082ef6f4de7dd31eacc0b2502d7263682
Cr-Commit-Position: refs/heads/master@{#437152}

[PhistucK, 2016-12-08 08:28:56]

phistuck@gmail.com changed reviewers:
+ phistuck@gmail.com

[PhistucK, 2016-12-08 08:28:56]

https://codereview.chromium.org/2560963002/diff/1/third_party/WebKit/Source/d...
File
third_party/WebKit/Source/devtools/front_end/formatter_worker/AcornTokenizer.js
(right):

https://codereview.chromium.org/2560963002/diff/1/third_party/WebKit/Source/d...
third_party/WebKit/Source/devtools/front_end/formatter_worker/AcornTokenizer.js:14:
this._tokenizer = acorn.tokenizer(this._content, {ecmaVersion: 7, onComment:
this._comments});
Maybe use a constant instead of using the same hard coded ecmaVersion number
everywhere?