Replace forward declarations with includes in TaskRunner APIs.

Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793
Committed: https://crrev.com/1d08c589d78f1e23d8813ba8bb5f265be22ee33e
Cr-Commit-Position: refs/heads/master@{#399044}

[fdoray, 2016-06-09 20:24:54]

Description was changed from

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

BUG=618793
==========

to

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793
==========

[fdoray, 2016-06-09 20:26:46]

fdoray@chromium.org changed reviewers:
+ danakj@chromium.org, jam@chromium.org

[fdoray, 2016-06-09 20:26:46]

jam@ and danakj@: Can you review this CL? Thanks.

[danakj, 2016-06-09 20:33:18]

Commented on the bug.

[danakj, 2016-06-09 22:04:53]

LGTM

[fdoray, 2016-06-09 22:48:42]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2016-06-09 22:49:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2053503004/20001

[commit-bot: I haz the power, 2016-06-09 22:55:16]

Description was changed from

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793
==========

to

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793
==========

[commit-bot: I haz the power, 2016-06-09 22:55:17]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-09 22:55:28]

CQ bit was unchecked

[commit-bot: I haz the power, 2016-06-09 22:57:03]

Description was changed from

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793
==========

to

==========
Replace forward declarations with includes in TaskRunner APIs.

This CL:
- Adds #include "base/location.h" in base/task_runner.h
- Adds #include "base/single_thread_task_runner.h"
      in base/threading/thread_task_runner_handle.h
- Adds #include "base/sequenced_task_runner.h"
      in base/threading/sequenced_task_runner_handle.h

This will be followed by a mass removal of includes that
are no longer necessary.

BUG=618793

Committed: https://crrev.com/1d08c589d78f1e23d8813ba8bb5f265be22ee33e
Cr-Commit-Position: refs/heads/master@{#399044}
==========

[commit-bot: I haz the power, 2016-06-09 22:57:04]

Patchset 2 (id:??) landed as
https://crrev.com/1d08c589d78f1e23d8813ba8bb5f265be22ee33e
Cr-Commit-Position: refs/heads/master@{#399044}

[jam, 2016-06-09 23:26:49]

lgtm, thanks