mac: Move the bookmark bar overflow chevron from pdf to png

BUG=111101
TEST=Bookmark many things, look at the overflow chevron.


Review URL: https://chromiumcodereview.appspot.com/11693003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@174726 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed