[chromeos] Fix chrome://cryptohome crash

[chromeos] Fix chrome://cryptohome crash

Check readiness of the token before requesting info on it, otherwise
this triggers a CHECK in GetTPMTokenInfo.

BUG=chromium-os:27499
TEST=navigate to chrome://cryptohome when token is not initialized.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=125783

[gauravsh-google, 2012-03-08 23:33:06]

stevenjb/gspencer: review
jhawkins: owners approval

[Greg Spencer (Chromium), 2012-03-08 23:37:54]

LGTM

[commit-bot: I haz the power, 2012-03-08 23:43:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gauravsh@chromium.org/9652017/1

[commit-bot: I haz the power, 2012-03-08 23:43:48]

Presubmit check for 9652017-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Missing LGTM from an OWNER for files in these directories:
    chrome/browser/ui/webui

[James Hawkins, 2012-03-09 00:13:27]

LGTM

[commit-bot: I haz the power, 2012-03-09 00:23:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gauravsh@chromium.org/9652017/1

[commit-bot: I haz the power, 2012-03-09 03:12:53]

Change committed as 125783