Index: wp-content/themes/twentytwelve/header.php
===================================================================
--- wp-content/themes/twentytwelve/header.php	(revision 21504)
+++ wp-content/themes/twentytwelve/header.php	(working copy)
@@ -17,7 +17,7 @@
 <!--<![endif]-->
 <head>
 <meta charset="<?php bloginfo( 'charset' ); ?>" />
-<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+<meta name="viewport" content="width=device-width" />
 <title><?php wp_title( '|', true, 'right' ); ?></title>
 <link rel="profile" href="http://gmpg.org/xfn/11" />
 <link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>" />
