New HiDPI spinner. Uses clean <span class="spinner"></span> markup.

Be on the lookout for weirdness.
props lessbloat. see #21456.



git-svn-id: http://core.svn.wordpress.org/trunk@22019 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-posts-list-table.php

@@ -1041,7 +1041,7 @@ class WP_Posts_List_Table extends WP_List_Table {
 				$update_text = __( 'Update' );
 				?>
 				<a accesskey="s" href="#inline-edit" title="<?php esc_attr_e( 'Update' ); ?>" class="button-primary save alignright"><?php echo esc_attr( $update_text ); ?></a>
-				<img class="waiting" style="display:none;" src="<?php echo esc_url( admin_url( 'images/wpspin_light.gif' ) ); ?>" alt="" />
+				<span class="spinner"></span>
 			<?php } else {
 				submit_button( __( 'Update' ), 'button-primary alignright', 'bulk_edit', false, array( 'accesskey' => 's' ) );
 			} ?>