Don't use the box shadow focus styling for the admin menu or toolbar. see #28267.

git-svn-id: https://develop.svn.wordpress.org/trunk@28616 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/common.css

@@ -265,8 +265,9 @@ a:focus {
 }
 
 #adminmenu a:focus,
-#adminmenu a:active,
 .screen-reader-text:focus {
+	-webkit-box-shadow: none;
+	box-shadow: none;
 	outline: none;
 }
 

src/wp-includes/css/admin-bar.css

@@ -65,6 +65,8 @@ html:lang(he-il) .rtl #wpadminbar *  {
 #wpadminbar select,
 #wpadminbar textarea,
 #wpadminbar div {
+	-webkit-box-shadow: none;
+	box-shadow: none;
 	outline: none;
 }