Media: Remove required attribute from media uploader file input field

Author: t-hamano

src/wp-admin/includes/media.php

@@ -2285,7 +2285,7 @@ function media_upload_form( $errors = null ) {
 			_ex( 'Upload', 'verb' );
 			?>
 		</label>
-		<input type="file" name="async-upload" id="async-upload" required />
+		<input type="file" name="async-upload" id="async-upload" />
 		<?php submit_button( _x( 'Upload', 'verb' ), 'primary', 'html-upload', false ); ?>
 		<a href="#" onclick="try{top.tb_remove();}catch(e){}; return false;"><?php _e( 'Cancel' ); ?></a>
 	</p>