Protect dictionary fetch operation in shutdown scenario.
Protect dictionary fetch operation in shutdown scenario.

In a shutdown scenario, the default context may already be nulled out,
and hence we need to avoid trying to get dictionaries at that late
juncture.

r=darin
Review URL: http://codereview.chromium.org/21462

git-svn-id: http://src.chromium.org/svn/trunk/src@9995 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 80396780f4174542c1e734880ffa69706254b97e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser