DevTools: fix crash caused by dereferening empty handle
DevTools: fix crash caused by dereferening empty handle

BUG: 31591

Review URL: http://codereview.chromium.org/549007

git-svn-id: http://src.chromium.org/svn/trunk/src@35911 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b6c73e1442ad8d75c90592bb7c4cbeca49220752
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