rAc: error validation UI updates

Make error validation bubbles look more like all other Chrome bubbles
(less custom, e.g. red and pointy).

R=estade@chromium.org
BUG=299300

Review URL: https://codereview.chromium.org/25804003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227458 0039d316-1c4b-4281-b951-d872f2087c98
Makes the system menu show on right click of the new tab button for win-aura

BUG=296090
TEST=verify right click on new tab button shows menu
R=ben@chromium.org

Review URL: https://codereview.chromium.org/26267002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227459 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227459