Pipe cmd-z back to browser.
Pipe cmd-z back to browser.

Followup to http://codereview.chromium.org/355016

BUG=26735
TEST=Focus web, hit cmd-z. Should blink menu bar. Same for cmd-shift-z.

Review URL: http://codereview.chromium.org/371031

git-svn-id: http://src.chromium.org/svn/trunk/src@31291 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2af821e15b487e486b2a703242d5d1d47f8dc533
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