Migrate registration state

Follow up to 5223e6e for existing installations that never set this flag.

// FREEBIE

js/database.js

@@ -80,6 +80,14 @@
                     });
                 });
             }
+        },
+        {
+            version: "5.0",
+            migrate: function(transaction, next) {
+                if (storage.get("chromiumRegistrationDone") === "") {
+                    storage.put("chromiumRegistrationDoneEver", "");
+                }
+            }
         }
     ];
 }());