Re-add ctrl-shift-w to Close Window, which I mistakenly removed long ago.
Re-add ctrl-shift-w to Close Window, which I mistakenly removed long ago.

BUG=none
TEST=ctrl-shift-w should close your current window.
Review URL: http://codereview.chromium.org/231025

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@27229 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