Simplify RunTaskOnThread

Simplify RunTaskOnThread

RunTaskOnThread has been running tasks synchronously if the task runner belongs to the current thread.
This behavior was necessary when it was allowed to access drive::FileSystem from both UI and IO threads.
But now, no one needs this behavior and every user uses this method to post tasks to the specified runner.

BUG=None

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284851

[kinaba, 2014-07-22 07:10:17]

lgtm

[hashimoto, 2014-07-22 07:17:47]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-07-22 07:19:35]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/408153003/1

[commit-bot: I haz the power, 2014-07-22 08:55:58]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[hashimoto, 2014-07-22 09:10:23]

Fixed FileCacheTest by adding base::RunLoop().RunUntilIdle();

[hashimoto, 2014-07-22 09:10:27]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-07-22 09:11:11]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/408153003/20001

[kinaba, 2014-07-22 09:11:30]

On 2014/07/22 09:10:23, hashimoto wrote:
> Fixed FileCacheTest by adding base::RunLoop().RunUntilIdle();

still lgtm

[commit-bot: I haz the power, 2014-07-22 11:07:21]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-07-22 12:23:33]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-22 12:23:34]

Try jobs failed on following builders:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[hashimoto, 2014-07-23 03:06:12]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-07-23 03:07:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/408153003/20001

[commit-bot: I haz the power, 2014-07-23 06:06:14]

Change committed as 284851