Remove the usage of BrowserThread::FILE in web_ui_user_script_loader.cc

Remove the usage of BrowserThread::FILE in web_ui_user_script_loader.cc

The usage of BrowserThread::FILE is deprecated in favor of the
post_task.h API.

BUG=689520
Review-Url: https://codereview.chromium.org/2898523002
Cr-Commit-Position: refs/heads/master@{#473387}
Committed: https://chromium.googlesource.com/chromium/src/+/40c99bcdd1a0c0bcd3dbcfd2c49733621eb40614

[Patrick Monette, 2017-05-19 21:09:41]

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

[commit-bot: I haz the power, 2017-05-19 21:10:56]

Dry run: 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, 2017-05-19 22:16:01]

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

[commit-bot: I haz the power, 2017-05-19 22:16:03]

Dry run: This issue passed the CQ dry run.

[Patrick Monette, 2017-05-19 22:23:34]

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

[Patrick Monette, 2017-05-19 22:23:36]

PTAL

[Devlin, 2017-05-19 22:52:46]

lgtm

[Patrick Monette, 2017-05-19 23:38:39]

Thanks!

[Patrick Monette, 2017-05-19 23:38:43]

The CQ bit was checked by pmonette@chromium.org

[commit-bot: I haz the power, 2017-05-19 23:39:25]

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, 2017-05-19 23:59:17]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495237123595610, "parent_rev":
"38dae1d492a4f53e5d5928a6c8be4a0f08d6e083", "commit_rev":
"40c99bcdd1a0c0bcd3dbcfd2c49733621eb40614"}

[commit-bot: I haz the power, 2017-05-19 23:59:26]

Description was changed from

==========
Remove the usage of BrowserThread::FILE in web_ui_user_script_loader.cc

The usage of BrowserThread::FILE is deprecated in favor of the
post_task.h API.

BUG=689520
==========

to

==========
Remove the usage of BrowserThread::FILE in web_ui_user_script_loader.cc

The usage of BrowserThread::FILE is deprecated in favor of the
post_task.h API.

BUG=689520

Review-Url: https://codereview.chromium.org/2898523002
Cr-Commit-Position: refs/heads/master@{#473387}
Committed:
https://chromium.googlesource.com/chromium/src/+/40c99bcdd1a0c0bcd3dbcfd2c497...
==========

[commit-bot: I haz the power, 2017-05-19 23:59:27]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/40c99bcdd1a0c0bcd3dbcfd2c497...