Remove ContextLifecycleObserer from XHRReplayData

Remove ContextLifecycleObserer from XHRReplayData

XHRReplayData inherits from ContextLifecycleObserer just to track
ExecutionContext. It should just hold a strong member to ExecutionContext.

BUG=610176
Committed: https://crrev.com/9a2f35081ced906786154065184f84d36df818c7
Cr-Commit-Position: refs/heads/master@{#436933}

[haraken, 2016-12-07 11:18:45]

haraken@chromium.org changed reviewers:
+ sigbjornf@opera.com

[haraken, 2016-12-07 11:18:46]

PTAL

[sof, 2016-12-07 12:04:16]

lgtm

[haraken, 2016-12-07 12:12:05]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2016-12-07 12:12:32]

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, 2016-12-07 13:47:52]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481112725086570, "parent_rev":
"ba62fe44b9999a97181a5a5ab6f12cb427e4af85", "commit_rev":
"c071769a235b305800e2357aa07ac2a23e8965db"}

[commit-bot: I haz the power, 2016-12-07 13:48:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-07 13:50:03]

Description was changed from

==========
Remove ContextLifecycleObserer from XHRReplayData

XHRReplayData inherits from ContextLifecycleObserer just to track
ExecutionContext. It should just hold a strong member to ExecutionContext.

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

to

==========
Remove ContextLifecycleObserer from XHRReplayData

XHRReplayData inherits from ContextLifecycleObserer just to track
ExecutionContext. It should just hold a strong member to ExecutionContext.

BUG=610176

Committed: https://crrev.com/9a2f35081ced906786154065184f84d36df818c7
Cr-Commit-Position: refs/heads/master@{#436933}
==========

[commit-bot: I haz the power, 2016-12-07 13:50:04]

Patchset 1 (id:??) landed as
https://crrev.com/9a2f35081ced906786154065184f84d36df818c7
Cr-Commit-Position: refs/heads/master@{#436933}