Avoid a CHECK when the modal_loop_pump_messages_event handle comes in as NULL to the renderer.  This happens with some "virus scanners".
Avoid a CHECK when the modal_loop_pump_messages_event handle comes in as NULL to the renderer.  This happens with some "virus scanners".

BUG=25583
Review URL: http://codereview.chromium.org/348046

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@30760 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser