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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@2209 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