[headless] Ensure devtooled tests call Disable/RemoveObserver.

[headless] Ensure devtooled tests call Disable/RemoveObserver.

Related to crbug.com/682670, where a missing RemoveObserver() call
caused a segfault. For completeness, this also adds Disable() calls
where they were missing.

BUG=

Review-Url: https://codereview.chromium.org/2642683004
Cr-Commit-Position: refs/heads/master@{#444737}
Committed: https://chromium.googlesource.com/chromium/src/+/6ccdcca31bc009460bc1cacedb2ada65588ddf12

[Eric Seckler, 2017-01-19 14:49:59]

Patchset #1 (id:1) has been deleted

[Eric Seckler, 2017-01-19 14:53:59]

Patchset #1 (id:20001) has been deleted

[Eric Seckler, 2017-01-19 14:54:36]

eseckler@chromium.org changed reviewers:
+ alexclarke@chromium.org

[Eric Seckler, 2017-01-19 14:54:36]

Thanks, Alex!

[Eric Seckler, 2017-01-19 14:54:50]

Thanks, Alex!

[alex clarke (OOO till 29th), 2017-01-19 15:00:14]

lgtm

[Eric Seckler, 2017-01-19 15:07:20]

The CQ bit was checked by eseckler@chromium.org

[commit-bot: I haz the power, 2017-01-19 15:07:43]

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, 2017-01-19 15:18:54]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1484838440248050,
"parent_rev": "12d9cdafee5f8ed2fa72868ec75c34eec0216000", "commit_rev":
"6ccdcca31bc009460bc1cacedb2ada65588ddf12"}

[commit-bot: I haz the power, 2017-01-19 15:19:23]

Description was changed from

==========
[headless] Ensure devtooled tests call Disable/RemoveObserver.

Related to crbug.com/682670, where a missing RemoveObserver() call
caused a segfault. For completeness, this also adds Disable() calls
where they were missing.

BUG=
==========

to

==========
[headless] Ensure devtooled tests call Disable/RemoveObserver.

Related to crbug.com/682670, where a missing RemoveObserver() call
caused a segfault. For completeness, this also adds Disable() calls
where they were missing.

BUG=

Review-Url: https://codereview.chromium.org/2642683004
Cr-Commit-Position: refs/heads/master@{#444737}
Committed:
https://chromium.googlesource.com/chromium/src/+/6ccdcca31bc009460bc1cacedb2a...
==========

[commit-bot: I haz the power, 2017-01-19 15:19:23]

Committed patchset #1 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/6ccdcca31bc009460bc1cacedb2a...