Mojo: Fix crash on MojoShell on Android

Mojo: Fix crash on MojoShell on Android

MojoShell crashed when it goes backgound then comes to front again.
It did hit an assertion in InitApplicationContext() that is expected
to be called oly once for each process.

This change ensures it to be called once at most.

TEST=none
BUG=none
R=abarth,beng

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266147

[Hajime Morrita, 2014-04-23 21:47:54]

PTAL? A trivial crash fix.

[abarth-chromium, 2014-04-23 21:52:09]

lgtm

[Hajime Morrita, 2014-04-23 21:52:45]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-04-23 21:53:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/morrita@chromium.org/249713006/1

[commit-bot: I haz the power, 2014-04-23 22:42:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-23 22:42:04]

Try jobs failed on following builders:
  tryserver.chromium on chromium_presubmit

[Hajime Morrita, 2014-04-23 22:45:48]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-04-23 22:46:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/morrita@chromium.org/249713006/1

[commit-bot: I haz the power, 2014-04-23 23:34:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-23 23:34:35]

Try jobs failed on following builders:
  tryserver.chromium on chromium_presubmit

[Hajime Morrita, 2014-04-25 00:10:57]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-04-25 00:11:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/morrita@chromium.org/249713006/20001

[commit-bot: I haz the power, 2014-04-25 07:34:04]

Change committed as 266147