Index: wp-admin/css/common.css
===================================================================
--- wp-admin/css/common.css	(revision 40291)
+++ wp-admin/css/common.css	(working copy)
@@ -779,7 +779,7 @@
 #bulk-titles div a:before,
 .notice-dismiss:before {
 	background: none;
-	color: #b4b9be;
+	color: #72777c;
 	content: "\f153";
 	display: block;
 	font: normal 16px/20px dashicons;
Index: wp-admin/css/media.css
===================================================================
--- wp-admin/css/media.css	(revision 40291)
+++ wp-admin/css/media.css	(working copy)
@@ -506,7 +506,7 @@
 	content: "\f153";
 	display: block;
 	font: normal 16px/1 dashicons;
-	color: #b4b9be;
+	color: #72777c;
 }
 
 .upload-php .mode-grid .media-sidebar .media-uploader-status .upload-dismiss-errors:focus:before,
Index: wp-includes/css/media-views.css
===================================================================
--- wp-includes/css/media-views.css	(revision 40291)
+++ wp-includes/css/media-views.css	(working copy)
@@ -1262,6 +1262,13 @@
 	transition: none;
 }
 
+.media-sidebar .media-uploader-status .upload-dismiss-errors:before {
+	content: "\f153";
+	display: block;
+	font: normal 16px/1 dashicons;
+	color: #72777c;
+}
+
 .upload-errors .upload-error {
 	padding: 12px;
 	margin-bottom: 12px;