Changes the order of widget Close() and DecrementDeferCounter().

Changes the order of widget Close() and DecrementDeferCounter().

This is a bit tricky scenario, but the current code may lead to
a mismatch of increment/decrement by calling Close(). See the bug
for how the mismatch happens.

BUG=238477
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=198829

[Dmitry Titov, 2013-05-07 00:49:32]

Awesome, great find, thanks!

lgtm

[dewittj, 2013-05-07 00:50:54]

lgtm - Can we get a browser test?

[commit-bot: I haz the power, 2013-05-07 16:30:36]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mukai@chromium.org/14820016/1

[commit-bot: I haz the power, 2013-05-07 16:44:54]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-05-07 20:55:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/mukai@chromium.org/14820016/1

[commit-bot: I haz the power, 2013-05-07 23:53:51]

Change committed as 198829