[Closure compiler] Fix extension_error_overlay.js closure compiler

[Closure compiler] Fix extension_error_overlay.js closure compiler

Committed: https://crrev.com/224eb3358720d3b93abc115a3906e6f0fbc3a479
Cr-Commit-Position: refs/heads/master@{#319718}

[Devlin, 2015-03-09 17:30:54]

rdevlin.cronin@chromium.org changed reviewers:
+ dbeam@chromium.org

[Devlin, 2015-03-09 17:35:51]

https://codereview.chromium.org/991953002/diff/1/chrome/browser/resources/ext...
File chrome/browser/resources/extensions/extension_code.js (right):

https://codereview.chromium.org/991953002/diff/1/chrome/browser/resources/ext...
chrome/browser/resources/extensions/extension_code.js:33: * @param
{?ExtensionHighlight} code The 'highlight' strings represent the
This fixes the compilation error, but why is it needed? 
https://developers.google.com/closure/compiler/docs/js-for-compiler states that
"All object types are nullable by default whether or not they are declared with
the Nullable operator".

[Dan Beam, 2015-03-09 17:36:27]

lgtm

[Devlin, 2015-03-09 17:37:14]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2015-03-09 17:37:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/991953002/1

[commit-bot: I haz the power, 2015-03-09 17:46:41]

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

[commit-bot: I haz the power, 2015-03-09 17:46:42]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Devlin, 2015-03-09 17:47:06]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2015-03-09 17:48:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/991953002/1

[commit-bot: I haz the power, 2015-03-09 20:13:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-09 20:14:46]

Patchset 1 (id:??) landed as
https://crrev.com/224eb3358720d3b93abc115a3906e6f0fbc3a479
Cr-Commit-Position: refs/heads/master@{#319718}