[Mac] Display the correct number of restorable tabs in the History menu.
[Mac] Display the correct number of restorable tabs in the History menu.

BUG=47797
TEST=Open a new window, create 4 NTP tabs and 1 navigated tab. Close the window. The History menu has a "1 Tab" submenu with the navigated page.

Review URL: http://codereview.chromium.org/2800032

git-svn-id: http://src.chromium.org/svn/trunk/src@51145 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c53791e9499059dd578421c9bbf79c85c26f3c5c
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