Add TODO.
Rename ROM Validator class to ROM File Validator.
Create file-ajax-loader class.
Simplify rom-loader class by using file-ajax-loader class.
Create file-drop-loader class.
Convert class to camel case.
Remove unused properties.
Reduce duplication by using file-drop-loader class.
Fix bad reference to 'this'.
Fix bad function reference.
Rename function.
Fix bad passing of URL to Ajax call.
Abstract logic into new function.
Rename function.
Make message more accurate.
Move function definitions.
Modify comment.
Rename function.
Abstract logic into its own function.
Rename function for clarity.