Posix: Catch SIGHUP/SIGINT and do a clean shutdown.
Posix: Catch SIGHUP/SIGINT and do a clean shutdown.

BUG=28746
TEST=Ctrl+C = clean shutdown.
Review URL: http://codereview.chromium.org/432019

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@33046 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