Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc.

Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc. (patchset #2 id:20001 of https://codereview.chromium.org/2835303002/ )

Reason for revert:
"FileDownloaderTest.DontOverwrite" is flaky.
crbug.com/715964

Original issue's description:
> Use TaskScheduler instead of blocking pool in file_downloader.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=asanka@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2835303002
> Cr-Commit-Position: refs/heads/master@{#467397}
> Committed: https://chromium.googlesource.com/chromium/src/+/4f0ba69f0ae32dc9e48fc021852585abb0df35b5

TBR=asanka@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892, 715964
Review-Url: https://codereview.chromium.org/2847553004
Cr-Commit-Position: refs/heads/master@{#467638}
Committed: https://chromium.googlesource.com/chromium/src/+/dfd5b6f49e5382da44646018e2471a3e9f15f96f

[vitaliii, 2017-04-27 11:32:21]

Created Revert of Use TaskScheduler instead of blocking pool in
file_downloader.cc.

[vitaliii, 2017-04-27 11:32:43]

Description was changed from

==========
Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc.
(patchset #2 id:20001 of https://codereview.chromium.org/2835303002/ )

Reason for revert:
"FileDownloaderTest.DontOverwrite" is flaky.
crbug.com/715964

Original issue's description:
> Use TaskScheduler instead of blocking pool in file_downloader.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=asanka@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2835303002
> Cr-Commit-Position: refs/heads/master@{#467397}
> Committed:
https://chromium.googlesource.com/chromium/src/+/4f0ba69f0ae32dc9e48fc0218525...

TBR=asanka@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892
==========

to

==========
Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc.
(patchset #2 id:20001 of https://codereview.chromium.org/2835303002/ )

Reason for revert:
"FileDownloaderTest.DontOverwrite" is flaky.
crbug.com/715964

Original issue's description:
> Use TaskScheduler instead of blocking pool in file_downloader.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=asanka@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2835303002
> Cr-Commit-Position: refs/heads/master@{#467397}
> Committed:
https://chromium.googlesource.com/chromium/src/+/4f0ba69f0ae32dc9e48fc0218525...

TBR=asanka@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892,715964
==========

[vitaliii, 2017-04-27 11:32:51]

The CQ bit was checked by vitaliii@chromium.org

[commit-bot: I haz the power, 2017-04-27 11:33:02]

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, 2017-04-27 11:33:21]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493292771919270, "parent_rev":
"c5cc2a4f4e1ae4dfd1459cba00e7d7a217bc1f70", "commit_rev":
"dfd5b6f49e5382da44646018e2471a3e9f15f96f"}

[commit-bot: I haz the power, 2017-04-27 11:33:36]

Description was changed from

==========
Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc.
(patchset #2 id:20001 of https://codereview.chromium.org/2835303002/ )

Reason for revert:
"FileDownloaderTest.DontOverwrite" is flaky.
crbug.com/715964

Original issue's description:
> Use TaskScheduler instead of blocking pool in file_downloader.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=asanka@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2835303002
> Cr-Commit-Position: refs/heads/master@{#467397}
> Committed:
https://chromium.googlesource.com/chromium/src/+/4f0ba69f0ae32dc9e48fc0218525...

TBR=asanka@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892,715964
==========

to

==========
Revert of Use TaskScheduler instead of blocking pool in file_downloader.cc.
(patchset #2 id:20001 of https://codereview.chromium.org/2835303002/ )

Reason for revert:
"FileDownloaderTest.DontOverwrite" is flaky.
crbug.com/715964

Original issue's description:
> Use TaskScheduler instead of blocking pool in file_downloader.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=asanka@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2835303002
> Cr-Commit-Position: refs/heads/master@{#467397}
> Committed:
https://chromium.googlesource.com/chromium/src/+/4f0ba69f0ae32dc9e48fc0218525...

TBR=asanka@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892,715964

Review-Url: https://codereview.chromium.org/2847553004
Cr-Commit-Position: refs/heads/master@{#467638}
Committed:
https://chromium.googlesource.com/chromium/src/+/dfd5b6f49e5382da44646018e247...
==========

[commit-bot: I haz the power, 2017-04-27 11:33:37]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/dfd5b6f49e5382da44646018e247...