[oilpan]: Ensure context destroyed is propagated to parent.

[oilpan]: Ensure context destroyed is propagated to parent.

With my previous fix for some of the websocket crashes I didn't propagated the fact that the context was destroyed to the base class. This resulted in some cases where we called unobserveContext with where the lifecycle context was actually dead, crashing since further down the stack since it ended up calling on zapped memory. This change should fix that.

R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178435

[Mads Ager (chromium), 2014-07-18 08:58:21]

lgtm

[tkent, 2014-07-18 09:06:45]

lgtm

[wibling-chromium, 2014-07-18 09:28:14]

The CQ bit was checked by wibling@chromium.org

[commit-bot: I haz the power, 2014-07-18 09:29:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wibling@chromium.org/407493003/1

[haraken, 2014-07-18 09:31:05]

LGTM

[commit-bot: I haz the power, 2014-07-18 10:46:01]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/16089)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/17680)

[commit-bot: I haz the power, 2014-07-18 11:46:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-18 11:46:48]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/17705)

[tkent, 2014-07-18 13:32:25]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-07-18 13:33:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wibling@chromium.org/407493003/1

[commit-bot: I haz the power, 2014-07-18 13:33:38]

Change committed as 178435