Revert of Remove DOMWindowProperty::willDetachGlobalObjectFromFrame

Revert of Remove DOMWindowProperty::willDetachGlobalObjectFromFrame (patchset #4 id:60001 of https://codereview.chromium.org/2138003002/ )

Reason for revert:
This CL caused flaky failures on http/tests/serviceworker.


Original issue's description:
> Remove DOMWindowProperty::willDetachGlobalObjectFromFrame
> 
> DOMWindowProperty::willDetachGlobalObjectFromFrame is dispatched
> at the same timing as ContextLifecycleObserver::contextDestroyed
> (via Document::detach). Hence this CL replaces DOMWindowProperty::willDetachGlobalObjectFromFrame
> with ContextLifecycleObserver::contextDestroyed.
> 
> BUG=610176
> 
> Committed: https://crrev.com/f18ffebd279ad21196d988f763313e4a460db316
> Cr-Commit-Position: refs/heads/master@{#404961}

TBR=dcheng@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=610176

[haraken, 2016-07-14 08:28:42]

The CQ bit was checked by haraken@chromium.org

[haraken, 2016-07-14 08:28:43]

Created Revert of Remove DOMWindowProperty::willDetachGlobalObjectFromFrame

[commit-bot: I haz the power, 2016-07-14 08:29:08]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[haraken, 2016-07-14 09:04:07]

The CQ bit was unchecked by haraken@chromium.org