Revert of Switch WindowedNotificationObserver to use base::RunLoop.

Revert of Switch WindowedNotificationObserver to use base::RunLoop. (patchset #4 id:60001 of https://codereview.chromium.org/2701473007/ )

Reason for revert:
Suspected of causing flakiness in PrintPreviewDialogControllerBrowserTest.ReloadInitiatorTab

More details in crbug.com/695835

Original issue's description:
> Switch WindowedNotificationObserver to use base::RunLoop.
> 
> Now it will quit the message loop immediately after receiving the
> notification. Also it does not allow nested tasks anymore.
> 
> BUG=668707
> 
> Review-Url: https://codereview.chromium.org/2701473007
> Cr-Commit-Position: refs/heads/master@{#452739}
> Committed: https://chromium.googlesource.com/chromium/src/+/474e1f148ab83dde92b93a93e53cf83d77b9be13

TBR=jochen@chromium.org,rdevlin.cronin@chromium.org,ahest@yandex-team.ru
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668707
Review-Url: https://codereview.chromium.org/2715733003
Cr-Commit-Position: refs/heads/master@{#452800}
Committed: https://chromium.googlesource.com/chromium/src/+/0fc562c98c420de40daa775a1aacb52a4760a9b4

[Marc Treib, 2017-02-24 12:48:07]

The CQ bit was checked by treib@chromium.org

[Marc Treib, 2017-02-24 12:48:08]

Created Revert of Switch WindowedNotificationObserver to use base::RunLoop.

[commit-bot: I haz the power, 2017-02-24 12:48:31]

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, 2017-02-24 12:49:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487940487846510, "parent_rev":
"fc76f66e81fa4cd323a108551ea59a9c1dfa3e3e", "commit_rev":
"0fc562c98c420de40daa775a1aacb52a4760a9b4"}

[commit-bot: I haz the power, 2017-02-24 12:49:56]

Description was changed from

==========
Revert of Switch WindowedNotificationObserver to use base::RunLoop. (patchset #4
id:60001 of https://codereview.chromium.org/2701473007/ )

Reason for revert:
Suspected of causing flakiness in
PrintPreviewDialogControllerBrowserTest.ReloadInitiatorTab

More details in crbug.com/695835

Original issue's description:
> Switch WindowedNotificationObserver to use base::RunLoop.
> 
> Now it will quit the message loop immediately after receiving the
> notification. Also it does not allow nested tasks anymore.
> 
> BUG=668707
> 
> Review-Url: https://codereview.chromium.org/2701473007
> Cr-Commit-Position: refs/heads/master@{#452739}
> Committed:
https://chromium.googlesource.com/chromium/src/+/474e1f148ab83dde92b93a93e53c...

TBR=jochen@chromium.org,rdevlin.cronin@chromium.org,ahest@yandex-team.ru
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668707
==========

to

==========
Revert of Switch WindowedNotificationObserver to use base::RunLoop. (patchset #4
id:60001 of https://codereview.chromium.org/2701473007/ )

Reason for revert:
Suspected of causing flakiness in
PrintPreviewDialogControllerBrowserTest.ReloadInitiatorTab

More details in crbug.com/695835

Original issue's description:
> Switch WindowedNotificationObserver to use base::RunLoop.
> 
> Now it will quit the message loop immediately after receiving the
> notification. Also it does not allow nested tasks anymore.
> 
> BUG=668707
> 
> Review-Url: https://codereview.chromium.org/2701473007
> Cr-Commit-Position: refs/heads/master@{#452739}
> Committed:
https://chromium.googlesource.com/chromium/src/+/474e1f148ab83dde92b93a93e53c...

TBR=jochen@chromium.org,rdevlin.cronin@chromium.org,ahest@yandex-team.ru
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=668707

Review-Url: https://codereview.chromium.org/2715733003
Cr-Commit-Position: refs/heads/master@{#452800}
Committed:
https://chromium.googlesource.com/chromium/src/+/0fc562c98c420de40daa775a1aac...
==========

[commit-bot: I haz the power, 2017-02-24 12:49:57]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/0fc562c98c420de40daa775a1aac...