Remove ContextLifecycleObserver from WaitUntilObserver

Remove ContextLifecycleObserver from WaitUntilObserver

WaitUntilObserver inherits from ContextLifecycleObserver just to keep
track of its associated ExecutionContext. It should just hold a strong
member to ExecutionContext.

BUG=610176
Committed: https://crrev.com/aff908ab80d22abb30c09624bf13fec0cbc38490
Cr-Commit-Position: refs/heads/master@{#437171}

[haraken, 2016-12-07 11:27:23]

haraken@chromium.org changed reviewers:
+ nhiroki@chromium.org

[haraken, 2016-12-07 11:27:24]

PTAL

[nhiroki, 2016-12-08 02:11:18]

lgtm

[haraken, 2016-12-08 02:21:13]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2016-12-08 02:21:54]

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, 2016-12-08 04:00:46]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481163673035140, "parent_rev":
"b48dfb2ba25d3fe4964656c8587def5ff70aaaa5", "commit_rev":
"51fc86c88eaf010144263eab3e44f16280c1b2ff"}

[commit-bot: I haz the power, 2016-12-08 04:01:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-08 04:03:38]

Description was changed from

==========
Remove ContextLifecycleObserver from WaitUntilObserver

WaitUntilObserver inherits from ContextLifecycleObserver just to keep
track of its associated ExecutionContext. It should just hold a strong
member to ExecutionContext.

BUG=610176
==========

to

==========
Remove ContextLifecycleObserver from WaitUntilObserver

WaitUntilObserver inherits from ContextLifecycleObserver just to keep
track of its associated ExecutionContext. It should just hold a strong
member to ExecutionContext.

BUG=610176

Committed: https://crrev.com/aff908ab80d22abb30c09624bf13fec0cbc38490
Cr-Commit-Position: refs/heads/master@{#437171}
==========

[commit-bot: I haz the power, 2016-12-08 04:03:38]

Patchset 1 (id:??) landed as
https://crrev.com/aff908ab80d22abb30c09624bf13fec0cbc38490
Cr-Commit-Position: refs/heads/master@{#437171}