Remove calls to MessageLoop::current() in components.

Remove calls to MessageLoop::current() in components.

Why?
The fact that there's a MessageLoop on the thread is an
unnecessary implementation detail. When browser threads
are migrated to base/task_scheduler, tasks will no longer
have access to a MessageLoop.

These changes were generated manually.

BUG=616447
R=caitkp@chromium.org

Committed: https://crrev.com/cddcf0efb1c2f1050c9e90a6cb849d25576e74f6
Cr-Commit-Position: refs/heads/master@{#401716}

[Cait (Slow), 2016-06-20 21:20:45]

lgtm

[fdoray, 2016-06-23 17:00:57]

The CQ bit was checked by fdoray@chromium.org

[fdoray, 2016-06-23 17:00:59]

The patchset sent to the CQ was uploaded after l-g-t-m from caitkp@chromium.org
Link to the patchset: https://codereview.chromium.org/2087583002/#ps20001
(title: "fix build errors")

[commit-bot: I haz the power, 2016-06-23 17:01:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2087583002/20001

[commit-bot: I haz the power, 2016-06-23 18:38:51]

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

[commit-bot: I haz the power, 2016-06-23 18:38:53]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[fdoray, 2016-06-23 20:20:27]

The CQ bit was checked by fdoray@chromium.org

[fdoray, 2016-06-23 20:20:28]

The patchset sent to the CQ was uploaded after l-g-t-m from caitkp@chromium.org
Link to the patchset: https://codereview.chromium.org/2087583002/#ps40001
(title: "fix test error")

[commit-bot: I haz the power, 2016-06-23 20:21:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2087583002/40001

[commit-bot: I haz the power, 2016-06-23 21:20:50]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-06-23 21:24:03]

Description was changed from

==========
Remove calls to MessageLoop::current() in components.

Why?
The fact that there's a MessageLoop on the thread is an
unnecessary implementation detail. When browser threads
are migrated to base/task_scheduler, tasks will no longer
have access to a MessageLoop.

These changes were generated manually.

BUG=616447
R=caitkp@chromium.org
==========

to

==========
Remove calls to MessageLoop::current() in components.

Why?
The fact that there's a MessageLoop on the thread is an
unnecessary implementation detail. When browser threads
are migrated to base/task_scheduler, tasks will no longer
have access to a MessageLoop.

These changes were generated manually.

BUG=616447
R=caitkp@chromium.org

Committed: https://crrev.com/cddcf0efb1c2f1050c9e90a6cb849d25576e74f6
Cr-Commit-Position: refs/heads/master@{#401716}
==========

[commit-bot: I haz the power, 2016-06-23 21:24:05]

Patchset 3 (id:??) landed as
https://crrev.com/cddcf0efb1c2f1050c9e90a6cb849d25576e74f6
Cr-Commit-Position: refs/heads/master@{#401716}