GTK: Store the contents of the clipboard to the clipboard manager on exit.
GTK: Store the contents of the clipboard to the clipboard manager on exit.

BUG=21744
TEST=Copy text from a webpage. Paste it into gedit. Close chrome. You should still be able to paste into gedit.

Review URL: http://codereview.chromium.org/5357011

git-svn-id: http://src.chromium.org/svn/trunk/src@67782 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c4e3dc07efcfc26d693e39bb9113fa091db0e6e0
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