Revert of file_manager: Migrate FILE thread to TaskScheduler

Revert of file_manager: Migrate FILE thread to TaskScheduler (patchset #2 id:60001 of https://codereview.chromium.org/2966713002/ )

Reason for revert:
Test FileManagerFileWatcherTest.WatchLocalFile broken on ASAN LSAN and MSAN bots, e.g.

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/22079
https://build.chromium.org/p/chromium.memory/builders/Linux%20ChromiumOS%20MSan%20Tests/builds/1486

Original issue's description:
> file_manager: Migrate FILE thread to TaskScheduler
> 
> BUG=689520
> TEST=new file in Downloads is detected and displayed instantly (file watching is working as before)
> 
> Review-Url: https://codereview.chromium.org/2966713002
> Cr-Commit-Position: refs/heads/master@{#483916}
> Committed: https://chromium.googlesource.com/chromium/src/+/28368492d9516e5363810b98a46f587ffb61a270

TBR=fukino@chromium.org,satorux@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=689520
Review-Url: https://codereview.chromium.org/2965903002
Cr-Commit-Position: refs/heads/master@{#483936}
Committed: https://chromium.googlesource.com/chromium/src/+/062e1f253f540160c760615b36bdefe9385efe74

[Timothy Loh, 2017-07-03 03:24:54]

The CQ bit was checked by timloh@chromium.org

[Timothy Loh, 2017-07-03 03:24:54]

Created Revert of file_manager: Migrate FILE thread to TaskScheduler

[commit-bot: I haz the power, 2017-07-03 03:25:00]

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, 2017-07-03 03:58:22]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499052294346990, "parent_rev":
"0b1e7c8b342d2856dcaa754a7070c4865a01680f", "commit_rev":
"062e1f253f540160c760615b36bdefe9385efe74"}

[commit-bot: I haz the power, 2017-07-03 03:58:38]

Description was changed from

==========
Revert of file_manager: Migrate FILE thread to TaskScheduler (patchset #2
id:60001 of https://codereview.chromium.org/2966713002/ )

Reason for revert:
Test FileManagerFileWatcherTest.WatchLocalFile broken on ASAN LSAN and MSAN
bots, e.g.

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%2...
https://build.chromium.org/p/chromium.memory/builders/Linux%20ChromiumOS%20MS...

Original issue's description:
> file_manager: Migrate FILE thread to TaskScheduler
> 
> BUG=689520
> TEST=new file in Downloads is detected and displayed instantly (file watching
is working as before)
> 
> Review-Url: https://codereview.chromium.org/2966713002
> Cr-Commit-Position: refs/heads/master@{#483916}
> Committed:
https://chromium.googlesource.com/chromium/src/+/28368492d9516e5363810b98a46f...

TBR=fukino@chromium.org,satorux@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=689520
==========

to

==========
Revert of file_manager: Migrate FILE thread to TaskScheduler (patchset #2
id:60001 of https://codereview.chromium.org/2966713002/ )

Reason for revert:
Test FileManagerFileWatcherTest.WatchLocalFile broken on ASAN LSAN and MSAN
bots, e.g.

https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%2...
https://build.chromium.org/p/chromium.memory/builders/Linux%20ChromiumOS%20MS...

Original issue's description:
> file_manager: Migrate FILE thread to TaskScheduler
> 
> BUG=689520
> TEST=new file in Downloads is detected and displayed instantly (file watching
is working as before)
> 
> Review-Url: https://codereview.chromium.org/2966713002
> Cr-Commit-Position: refs/heads/master@{#483916}
> Committed:
https://chromium.googlesource.com/chromium/src/+/28368492d9516e5363810b98a46f...

TBR=fukino@chromium.org,satorux@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=689520

Review-Url: https://codereview.chromium.org/2965903002
Cr-Commit-Position: refs/heads/master@{#483936}
Committed:
https://chromium.googlesource.com/chromium/src/+/062e1f253f540160c760615b36bd...
==========

[commit-bot: I haz the power, 2017-07-03 03:58:39]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/062e1f253f540160c760615b36bd...

[satorux1, 2017-07-03 03:59:18]

lgtm. thank you for reverting this. let me test with asan locally.

[satorux1, 2017-07-04 01:13:27]

FWIW, https://codereview.chromium.org/2970653002/ is a patch for relanding with
a fix.