Revert of Use background tasks for the compiler dispatcher

Revert of Use background tasks for the compiler dispatcher (patchset #5 id:80001 of https://codereview.chromium.org/2606263002/ )

Reason for revert:
Causes IgnitionCompilerDispatcherTest.FinishNowWithBackgroundTask to fail.

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%20debug/builds/11209

Original issue's description:
> Use background tasks for the compiler dispatcher
> 
> BUG=v8:5215
> R=marja@chromium.org,vogelheim@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2606263002
> Cr-Commit-Position: refs/heads/master@{#42035}
> Committed: https://chromium.googlesource.com/v8/v8/+/7a1b3a7bebbef88e72c9f7747e1930f10ee10c80

TBR=marja@chromium.org,vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5215
Review-Url: https://codereview.chromium.org/2614433002
Cr-Commit-Position: refs/heads/master@{#42037}
Committed: https://chromium.googlesource.com/v8/v8/+/d4b5bfe306077f8f96a2c572f18aac0118b60477

[rmcilroy, 2017-01-03 15:51:32]

The CQ bit was checked by rmcilroy@chromium.org

[rmcilroy, 2017-01-03 15:51:32]

Created Revert of Use background tasks for the compiler dispatcher

[commit-bot: I haz the power, 2017-01-03 15:51:37]

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, 2017-01-03 15:51:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483458692358380, "parent_rev":
"37de62c991d23be2675ebe8092972abc99b39afe", "commit_rev":
"d4b5bfe306077f8f96a2c572f18aac0118b60477"}

[commit-bot: I haz the power, 2017-01-03 15:51:47]

Description was changed from

==========
Revert of Use background tasks for the compiler dispatcher (patchset #5 id:80001
of https://codereview.chromium.org/2606263002/ )

Reason for revert:
Causes IgnitionCompilerDispatcherTest.FinishNowWithBackgroundTask to fail.

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%2...

Original issue's description:
> Use background tasks for the compiler dispatcher
> 
> BUG=v8:5215
> R=marja@chromium.org,vogelheim@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2606263002
> Cr-Commit-Position: refs/heads/master@{#42035}
> Committed:
https://chromium.googlesource.com/v8/v8/+/7a1b3a7bebbef88e72c9f7747e1930f10ee...

TBR=marja@chromium.org,vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5215
==========

to

==========
Revert of Use background tasks for the compiler dispatcher (patchset #5 id:80001
of https://codereview.chromium.org/2606263002/ )

Reason for revert:
Causes IgnitionCompilerDispatcherTest.FinishNowWithBackgroundTask to fail.

https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%2...

Original issue's description:
> Use background tasks for the compiler dispatcher
> 
> BUG=v8:5215
> R=marja@chromium.org,vogelheim@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2606263002
> Cr-Commit-Position: refs/heads/master@{#42035}
> Committed:
https://chromium.googlesource.com/v8/v8/+/7a1b3a7bebbef88e72c9f7747e1930f10ee...

TBR=marja@chromium.org,vogelheim@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5215

Review-Url: https://codereview.chromium.org/2614433002
Cr-Commit-Position: refs/heads/master@{#42037}
Committed:
https://chromium.googlesource.com/v8/v8/+/d4b5bfe306077f8f96a2c572f18aac0118b...
==========

[commit-bot: I haz the power, 2017-01-03 15:51:48]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/d4b5bfe306077f8f96a2c572f18aac0118b...