Consolidate bubble border code.
Per 135200, we should only use image based code.
- Add two new sets of bubble border images;
- Use the new bubble border images for app menu and launcher tooltip;
- Get rid of BubbleBorder2 since it's no longer needed;
BUG=135200
TEST=Verify app list, launcher bar tooltip bubbles use shadow based on image and no artifacts.
R=msw@chromium.org,sky@chromium.org,oshima@chromium.org
Review URL: https://codereview.chromium.org/
10905311
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@158003 0039d316-1c4b-4281-b951-d872f2087c98