[cros] Fix regression making impossible to select grey G+ avatar.

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index 8aa31816ed2cdcb354e4259b2b529609ba6e0ff0..bee94afa9323bfc6f609b5e57194425594791c6d 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -571,7 +571,7 @@ void UserManagerImpl::SaveUserImageFromProfileImage(
   } else {
     // No profile image - use the stub image (gray avatar).
     SetUserImage(username, User::kProfileImageIndex,
-                 GURL(), UserImage(SkBitmap()));
+                 GURL(), UserImage::CreateAndEncode(SkBitmap()));
     SaveImageToLocalState(username, "", User::kProfileImageIndex,
                           GURL(), false);
   }