Do not set the user's avatar image to a stub twice in a row

This CL contains a small clean-up missed in CL 136763003. The user avatar
image is needlessly being set to a stub twice in a row.

BUG=331365
TEST=None

Review URL: https://codereview.chromium.org/134423005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245911 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/login/user_image_manager_impl.cc

@@ -548,7 +548,6 @@ void UserImageManagerImpl::LoadUserImage() {
     // * The profile image is to be used but has not been downloaded yet. The
     //   profile image will be downloaded after login.
     // * The image needs migration. Migration will be performed after login.
-    user->SetStubImage(image_index, true);
     return;
   }