Scroll to the top when toggling sections on the NTP.
Scroll to the top when toggling sections on the NTP.

BUG=56075
TEST=Open NTP. Make window small enough to scroll. Open a different
section, then reopen the original section. Scroll should have returned
to top.

Review URL: http://codereview.chromium.org/3415016

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@59870 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser