[Mac] Implement unspoofable infobars.
Each infobar is responsible for drawing a little tab-like bulge that pushes into
the browser frame (or another infobar, if there is more than one).
XIB changes:
* Increase the height of Infobar.xib 9px to account for the bulge
* Slide the image and text over so that the image is now aligned for the bulge
BUG=57106
TEST=Go to http://it.wikipedia.org and get an infobar. Open the Task Manager and force-quit an extension to get a second infobar. Both have the bulge.
Review URL: http://codereview.chromium.org/6250080
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@73490 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed
