function wpautop($pee, $br = 1) {

function wpautop($pee, $br = 0) {

Solution - 1

I think author wants to remove this br-s from pages, your approach seems to work on posts? Also, removing whole 'wpautop' filter kills all wordpress formating like p tags, if you want to remove just the br tags, you might try adding this to your functions.php file in theme folder:

function my_wpautop_correction() {	
	if( is_page() ) {		
		function my_wpautop( $pee ) {
			return wpautop($pee, 0);
		}		
		remove_filter( 'the_content', 'wpautop' );
		remove_filter( 'the_excerpt', 'wpautop' );		
		add_filter( 'the_content', 'my_wpautop' );		
		add_filter( 'the_excerpt', 'my_wpautop' );		
	}
}
add_action('pre_get_posts', 'my_wpautop_correction');

function my_wpautop_correction() {	
	if( is_page() ) {		
		remove_filter( 'the_content', 'wpautop' );
		remove_filter( 'the_excerpt', 'wpautop' );			
	}
}
add_action('pre_get_posts', 'my_wpautop_correction');

Solution - 2

Try this in your functions.php file:

add_action( 'pre_get_posts', 'mfields_remove_autop_from_posts' );
function mfields_remove_autop_from_posts() {
	if( !is_page() && !is_attachment() )
		remove_filter( 'the_content', 'wpautop' );
}