Align custom background tab images correctly.
Align custom background tab images correctly.

BUG=16879
TEST=Install a theme with a background tab image and verify that the image is aligned to the top of the tab, and not to the top of the frame.

Review URL: http://codereview.chromium.org/149727

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@20837 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