WP: The search form in the admin bar can cause a security warning over HTTPS (SSL). This snippet disables the search form in the admin bar.

disable_admin_bar_search.php

<?php

// Disable search icon and input in admin bar
add_action( 'wp_before_admin_bar_render', 'intw_disable_admin_bar_search' );
function intw_disable_admin_bar_search() {
	global $wp_admin_bar;
	$wp_admin_bar->remove_menu('search');
}