Avoid starting the pause timer if it is already started.
Avoid starting the pause timer if it is already started.

R=sky

Review URL: http://codereview.chromium.org/2443

git-svn-id: http://src.chromium.org/svn/trunk/src@2083 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 851ea6b86b76e9a1308497c29918e2ec91cd18d3
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