GitLab

Make sure profile shortcut manager does not create a user level shortcut when a system level one exists.

BUG=169495
TEST=New unit tests and manual steps described in the bug.

Review URL: https://chromiumcodereview.appspot.com/11876027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177256 0039d316-1c4b-4281-b951-d872f2087c98