aura: Fix crash in RootWindowHostX11::GetXImage().

aura: Fix crash in RootWindowHostX11::GetXImage().

r195926 accidentally broke a NULL check against
XGetImage()'s return value.

BUG=270311
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=216933

[commit-bot: I haz the power, 2013-08-10 17:08:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/22261009/1

[tfarina, 2013-08-10 17:08:58]

+sadrul, for ui/aura OWNERS.

https://codereview.chromium.org/22261009/diff/1/ui/aura/root_window_host_x11.cc
File ui/aura/root_window_host_x11.cc (right):

https://codereview.chromium.org/22261009/diff/1/ui/aura/root_window_host_x11....
ui/aura/root_window_host_x11.cc:1095: if (!image->get()) {
ok.

[sadrul, 2013-08-10 17:12:56]

lgtm

[Daniel Erat, 2013-08-10 17:16:54]

Thanks! Mind taking another quick look? I've deleted GetXImage() to make the
code simpler; the other method that used to call it doesn't exist anymore.

[sadrul, 2013-08-10 17:28:03]

Nice. lgtm

[commit-bot: I haz the power, 2013-08-10 17:35:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/22261009/9001

[commit-bot: I haz the power, 2013-08-10 20:08:55]

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

[commit-bot: I haz the power, 2013-08-11 14:19:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/derat@chromium.org/22261009/9001

[commit-bot: I haz the power, 2013-08-12 05:22:48]

Change committed as 216933