GitLab

BUG=chromium-os:23210
TEST=Manual: on the Login screen, users who selected profile image but don't have one should be displayed with a gray avatar.

Review URL: http://codereview.chromium.org/8634007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111160 0039d316-1c4b-4281-b951-d872f2087c98