[Mac] Update location-bar icon as user types.
[Mac] Update location-bar icon as user types.

Update in |OnChanged()|, just like Windows.

BUG=41362
TEST=Type "www.google.com".  You should have a globe icon.
TEST=Add a space after first 'w'.  Should get search icon.
TEST=Generally, icon will switch around as you type.

Review URL: http://codereview.chromium.org/1640012

git-svn-id: http://src.chromium.org/svn/trunk/src@44572 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 3bd0755fdcb5c1775447aeab4d6c9080a0e4a43f
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser