Fix coredump in Accessibility Manager SetProfile on shutdown.

Fix coredump in Accessibility Manager SetProfile on shutdown.

BUG=none

Committed: https://crrev.com/bda078cff49cde6e654da3a7bd4f41230cc7fe96
Cr-Commit-Position: refs/heads/master@{#308345}

[Ivan Podogov, 2014-12-11 13:56:06]

ginkage@chromium.org changed reviewers:
+ dtseng@chromium.org

[Ivan Podogov, 2014-12-11 14:00:48]

When shutting down, chromeos::AccessibilityManager::SetProfile is called as
SetProfile(NULL). At the end of this function number of Update*FromPref routines
is called:

959	    UpdateBrailleImeState();
960	  UpdateLargeCursorFromPref();
961	  UpdateStickyKeysFromPref();
962	  UpdateSpokenFeedbackFromPref();
963	  UpdateHighContrastFromPref();
964	  UpdateAutoclickFromPref();
965	  UpdateAutoclickDelayFromPref();
966	  UpdateVirtualKeyboardFromPref();

All of them *except* UpdateAutoclickFromPref and UpdateAutoclickDelayFromPref
have an "if (!profile_)" check, so that they do not crash...

[David Tseng, 2014-12-11 21:09:09]

lgtm

[Ivan Podogov, 2014-12-15 13:36:42]

The CQ bit was checked by ginkage@chromium.org

[commit-bot: I haz the power, 2014-12-15 13:37:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/791393002/1

[commit-bot: I haz the power, 2014-12-15 14:25:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-15 14:25:43]

Patchset 1 (id:??) landed as
https://crrev.com/bda078cff49cde6e654da3a7bd4f41230cc7fe96
Cr-Commit-Position: refs/heads/master@{#308345}