Prevent test shell editing events from getting to the webview delegate after test shell shutdown.
Prevent test shell editing events from getting to the webview delegate after test shell shutdown.

BUG=9486

Review URL: http://codereview.chromium.org/63091

git-svn-id: http://src.chromium.org/svn/trunk/src@13294 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 473369d090bef2f4bccc5fa7ddee4eb86f9600a9
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