Android: Fix potential null-ptr deref

Android: Fix potential null-ptr deref

BrowserGpuChannelHostFactory::GetGpuChannel() can
return NULL. In particular it already checks
IsLost() and returns NULL if that is the case.

BUG=445945
Committed: https://crrev.com/62e2fc7f7dd1d2f29c6299efa1535c8894d4cb4c
Cr-Commit-Position: refs/heads/master@{#314683}

[no sievers, 2015-02-04 23:07:50]

sievers@chromium.org changed reviewers:
+ epenner@chromium.org

[no sievers, 2015-02-04 23:07:57]

ptal

[epennerAtGoogle, 2015-02-04 23:10:26]

epenner@google.com changed reviewers:
+ epenner@google.com

[epennerAtGoogle, 2015-02-04 23:10:27]

LGTM

[no sievers, 2015-02-04 23:11:12]

The CQ bit was checked by sievers@chromium.org

[commit-bot: I haz the power, 2015-02-04 23:12:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/867093004/1

[commit-bot: I haz the power, 2015-02-05 00:02:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 00:04:24]

Patchset 1 (id:??) landed as
https://crrev.com/62e2fc7f7dd1d2f29c6299efa1535c8894d4cb4c
Cr-Commit-Position: refs/heads/master@{#314683}