When stopping QTKit video capture, call stopRunning before removeInput:.

When stopping QTKit video capture, call stopRunning before removeInput:.

Empirically, this prevents a browser hang when the active camera is
unplugged.  The unplug event triggers both stopping the capturer and
enumerating the available input devices at the same time.  It seems
that calling removeInput: on a running capturer after an error
produces a deadlock, but stopping the capturer first resolves the
problem.

BUG=285053
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=242936

[wjia(left Chromium), 2014-01-03 00:17:07]

lgtm

[commit-bot: I haz the power, 2014-01-03 00:18:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bemasc@chromium.org/120963003/1

[commit-bot: I haz the power, 2014-01-03 01:06:06]

Retried try job too often on linux_rel for step(s) chromedriver2_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2014-01-03 17:05:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bemasc@chromium.org/120963003/1

[commit-bot: I haz the power, 2014-01-03 17:56:11]

Retried try job too often on mac_rel for step(s) chromedriver2_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2014-01-03 17:58:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bemasc@chromium.org/120963003/1

[commit-bot: I haz the power, 2014-01-03 18:45:57]

Retried try job too often on mac_rel for step(s) chromedriver2_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2014-01-03 21:07:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bemasc@chromium.org/120963003/1

[commit-bot: I haz the power, 2014-01-03 22:06:45]

Change committed as 242936