Revert of Move ImageLoader timer to frame-specific TaskRunnerTimer.

Revert of Move ImageLoader timer to frame-specific TaskRunnerTimer. (patchset #2 id:20001 of https://codereview.chromium.org/2642103002/ )

Reason for revert:
To the best of my knowledge, I guess this CL is going to be a culprit of the memory leak:

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty%20Leak/builds/1645

Let me revert this CL and see how it goes. I'll reland it if my guess is wrong.

Original issue's description:
> Move ImageLoader timer to frame-specific TaskRunnerTimer.
>
> Move ImageLoader timer m_derefElementTimer to frame-specific TaskRunnerTimer.
> This associates it with the frame's Networking timer task queue.
>
> BUG=624694
>
> Review-Url: https://codereview.chromium.org/2642103002
> Cr-Commit-Position: refs/heads/master@{#444927}
> Committed: https://chromium.googlesource.com/chromium/src/+/ce1a9c0e454b08c96ca73788a1b4dccb405ce027

TBR=gogag2@gmail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624694
Review-Url: https://codereview.chromium.org/2644933003
Cr-Commit-Position: refs/heads/master@{#445007}
Committed: https://chromium.googlesource.com/chromium/src/+/c2e4a5276554d15581395ce6b5aec9023f0c6031

[haraken, 2017-01-20 07:31:08]

The CQ bit was checked by haraken@chromium.org

[haraken, 2017-01-20 07:31:08]

Created Revert of Move ImageLoader timer to frame-specific TaskRunnerTimer.

[commit-bot: I haz the power, 2017-01-20 07:31:23]

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, 2017-01-20 07:32:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484897468078820, "parent_rev":
"f34f5cb8f4f2f4a54afe4094dc7933193220116e", "commit_rev":
"c2e4a5276554d15581395ce6b5aec9023f0c6031"}

[commit-bot: I haz the power, 2017-01-20 07:33:05]

Description was changed from

==========
Revert of Move ImageLoader timer to frame-specific TaskRunnerTimer. (patchset #2
id:20001 of https://codereview.chromium.org/2642103002/ )

Reason for revert:
To the best of my knowledge, I guess this CL is going to be a culprit of the
memory leak:

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty...

Let me revert this CL and see how it goes. I'll reland it if my guess is wrong.


Original issue's description:
> Move ImageLoader timer to frame-specific TaskRunnerTimer.
> 
> Move ImageLoader timer m_derefElementTimer to frame-specific TaskRunnerTimer.
> This associates it with the frame's Networking timer task queue.
> 
> BUG=624694
> 
> Review-Url: https://codereview.chromium.org/2642103002
> Cr-Commit-Position: refs/heads/master@{#444927}
> Committed:
https://chromium.googlesource.com/chromium/src/+/ce1a9c0e454b08c96ca73788a1b4...

TBR=gogag2@gmail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624694
==========

to

==========
Revert of Move ImageLoader timer to frame-specific TaskRunnerTimer. (patchset #2
id:20001 of https://codereview.chromium.org/2642103002/ )

Reason for revert:
To the best of my knowledge, I guess this CL is going to be a culprit of the
memory leak:

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Trusty...

Let me revert this CL and see how it goes. I'll reland it if my guess is wrong.

Original issue's description:
> Move ImageLoader timer to frame-specific TaskRunnerTimer.
>
> Move ImageLoader timer m_derefElementTimer to frame-specific TaskRunnerTimer.
> This associates it with the frame's Networking timer task queue.
>
> BUG=624694
>
> Review-Url: https://codereview.chromium.org/2642103002
> Cr-Commit-Position: refs/heads/master@{#444927}
> Committed:
https://chromium.googlesource.com/chromium/src/+/ce1a9c0e454b08c96ca73788a1b4...

TBR=gogag2@gmail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=624694

Review-Url: https://codereview.chromium.org/2644933003
Cr-Commit-Position: refs/heads/master@{#445007}
Committed:
https://chromium.googlesource.com/chromium/src/+/c2e4a5276554d15581395ce6b5ae...
==========

[commit-bot: I haz the power, 2017-01-20 07:33:06]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/c2e4a5276554d15581395ce6b5ae...