Accessibility: Reduce the WordPress shades of grey, Episode 3.

Also, removes some no more used CSS.

See #35783.
Built from https://develop.svn.wordpress.org/trunk@36904


git-svn-id: http://core.svn.wordpress.org/trunk@36872 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/ie.css

@@ -244,7 +244,7 @@ table.fixed td {
 }
 
 #wpbody-content .postbox {
-	border: 1px solid #dfdfdf;
+	border: 1px solid #ddd;
 }
 
 #wpbody-content .postbox .hndle {
@@ -687,7 +687,7 @@ input[type="password"],
 * html .stuffbox,
 * html .stuffbox input,
 * html .stuffbox textarea {
-	border: 1px solid #DFDFDF;
+	border: 1px solid #ddd;
 }
 
 * html div.widget-liquid-left {
@@ -721,7 +721,7 @@ input[type="password"],
 }
 
 * html input {
-	border: 1px solid #dfdfdf;
+	border: 1px solid #ddd;
 }
 
 * html .edit-box {