[History service] Fix wrong thread used for SetLastResortFavicon

[History service] Fix a typo in SetLastResortFavicons

Previously, backend task were not performed on the right thread which
caused a crash in debug-build.

This CL assigns the task to the the right task runner.

BUG=644102
Review-Url: https://codereview.chromium.org/2788443003
Cr-Commit-Position: refs/heads/master@{#461124}
Committed: https://chromium.googlesource.com/chromium/src/+/9113ea78bc7a96ef8ba2b89a26aafd2fbc0b55e8

[jkrcal, 2017-03-30 16:27:20]

jkrcal@chromium.org changed reviewers:
+ mastiz@chromium.org, sky@chromium.org

[jkrcal, 2017-03-30 16:27:21]

Scott, could you PTAL?

Mikel, just double-checking that this "mistake" was not intentional.

[jkrcal, 2017-03-30 20:52:28]

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

[commit-bot: I haz the power, 2017-03-30 20:53:37]

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, 2017-03-30 22:02:15]

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

[commit-bot: I haz the power, 2017-03-30 22:02:16]

Dry run: Try jobs failed on following builders:
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)

[mastiz, 2017-03-31 06:58:02]

LGTM.

Thanks Jan for fixing this! Another concern comes to mind: none of these
functions have any test coverage :-(

[jkrcal, 2017-03-31 07:13:25]

jkrcal@chromium.org changed reviewers:
+ sdefresne@chromium.org

[jkrcal, 2017-03-31 07:13:26]

Sylvain, could you please take an owners look?
(I would like to land this and dependent CLs before FF)

[jkrcal, 2017-03-31 13:51:20]

Description was changed from

==========
[History service] Fix a typo in SetLastResortFavicons

Previously, backend task were not performed on the right thread which
caused a crash in debug-build.

This CL assigns the task to the the right task runner.

BUG=644102
==========

to

==========
[History service] Fix a typo in SetLastResortFavicons

Previously, backend task were not performed on the right thread which
caused a crash in debug-build.

This CL assigns the task to the the right task runner.

BUG=644102
==========

[sky, 2017-03-31 14:25:04]

LGTM

[jkrcal, 2017-03-31 15:02:55]

The CQ bit was checked by jkrcal@chromium.org

[commit-bot: I haz the power, 2017-03-31 15:03:12]

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, 2017-03-31 15:09:00]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490972575083150, "parent_rev":
"e8ff078cc3b53a20c192a72e5c09fe9a9d0d88c2", "commit_rev":
"9113ea78bc7a96ef8ba2b89a26aafd2fbc0b55e8"}

[commit-bot: I haz the power, 2017-03-31 15:09:56]

Description was changed from

==========
[History service] Fix a typo in SetLastResortFavicons

Previously, backend task were not performed on the right thread which
caused a crash in debug-build.

This CL assigns the task to the the right task runner.

BUG=644102
==========

to

==========
[History service] Fix a typo in SetLastResortFavicons

Previously, backend task were not performed on the right thread which
caused a crash in debug-build.

This CL assigns the task to the the right task runner.

BUG=644102

Review-Url: https://codereview.chromium.org/2788443003
Cr-Commit-Position: refs/heads/master@{#461124}
Committed:
https://chromium.googlesource.com/chromium/src/+/9113ea78bc7a96ef8ba2b89a26aa...
==========

[commit-bot: I haz the power, 2017-03-31 15:09:57]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9113ea78bc7a96ef8ba2b89a26aa...