Revert of Use the loading task runner for mojo-loading

Revert of Use the loading task runner for mojo-loading (patchset #1 id:1 of https://codereview.chromium.org/2710403002/ )

Reason for revert:
Breaking virtual/mojo-loading layout tests.

Original issue's description:
> Use the loading task runner for mojo-loading
> 
> BUG=603396
> 
> Review-Url: https://codereview.chromium.org/2710403002
> Cr-Commit-Position: refs/heads/master@{#452778}
> Committed: https://chromium.googlesource.com/chromium/src/+/63e321a30306e18812ad0cdaa6be57964497ac01

TBR=tzik@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=603396
Review-Url: https://codereview.chromium.org/2717523004
Cr-Commit-Position: refs/heads/master@{#452790}
Committed: https://chromium.googlesource.com/chromium/src/+/eb9d3ad9b2c939b6fa108d544b61df54a1eadebb

[yhirano, 2017-02-24 10:32:38]

The CQ bit was checked by yhirano@chromium.org

[yhirano, 2017-02-24 10:32:39]

Created Revert of Use the loading task runner for mojo-loading

[commit-bot: I haz the power, 2017-02-24 10:32:55]

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, 2017-02-24 10:33:38]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487932358925500, "parent_rev":
"9886ea7758ec1eba22f6787b21159c531e0808a1", "commit_rev":
"eb9d3ad9b2c939b6fa108d544b61df54a1eadebb"}

[commit-bot: I haz the power, 2017-02-24 10:34:11]

Description was changed from

==========
Revert of Use the loading task runner for mojo-loading (patchset #1 id:1 of
https://codereview.chromium.org/2710403002/ )

Reason for revert:
Breaking virtual/mojo-loading layout tests.

Original issue's description:
> Use the loading task runner for mojo-loading
> 
> BUG=603396
> 
> Review-Url: https://codereview.chromium.org/2710403002
> Cr-Commit-Position: refs/heads/master@{#452778}
> Committed:
https://chromium.googlesource.com/chromium/src/+/63e321a30306e18812ad0cdaa6be...

TBR=tzik@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=603396
==========

to

==========
Revert of Use the loading task runner for mojo-loading (patchset #1 id:1 of
https://codereview.chromium.org/2710403002/ )

Reason for revert:
Breaking virtual/mojo-loading layout tests.

Original issue's description:
> Use the loading task runner for mojo-loading
> 
> BUG=603396
> 
> Review-Url: https://codereview.chromium.org/2710403002
> Cr-Commit-Position: refs/heads/master@{#452778}
> Committed:
https://chromium.googlesource.com/chromium/src/+/63e321a30306e18812ad0cdaa6be...

TBR=tzik@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=603396

Review-Url: https://codereview.chromium.org/2717523004
Cr-Commit-Position: refs/heads/master@{#452790}
Committed:
https://chromium.googlesource.com/chromium/src/+/eb9d3ad9b2c939b6fa108d544b61...
==========

[commit-bot: I haz the power, 2017-02-24 10:34:12]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/eb9d3ad9b2c939b6fa108d544b61...