Hit test zone for the new tab button should follow its visible shape.
Hit test zone for the new tab button should follow its visible shape.

B=2270
Review URL: http://codereview.chromium.org/2843

git-svn-id: http://src.chromium.org/svn/trunk/src@2209 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ede3f1b59b0af0e51d40b288a580c8c326935010
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