Enable/disable "next/previous tab" commands when there is only 1 tab. BUG=26951 TEST=make sure next/previous tab menu items are correctly enabled/disabled based on the number of tabs.
Enable/disable "next/previous tab" commands when there is only 1 tab.
BUG=26951
TEST=make sure next/previous tab menu items are correctly enabled/disabled based on the number of tabs.

git-svn-id: http://src.chromium.org/svn/trunk/src@34554 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2f28f9a5611b683bbda460973a9f4f8bb2e7f97b
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