Remove assertion on instance destruction.

Remove assertion on instance destruction.

The way that we do the wrappers now with InstanceHandles means there's no danger of dangling pointers, and actually that you can't unregister yourself during instance shutdown since the PP_Instance->pp::Instance mapping has been torn down by the time the instance destructor is called.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=124119

[jam, 2012-02-28 20:09:10]

lgtm

[commit-bot: I haz the power, 2012-02-28 21:21:15]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/brettw@chromium.org/9519001/1

[commit-bot: I haz the power, 2012-02-28 22:45:25]

Try job failure for 9519001-1 (retry) on linux_rel for step "browser_tests".
It's a second try, previously, step "browser_tests" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...