Index: src/wp-admin/css/media.css
===================================================================
--- src/wp-admin/css/media.css	(revision 30461)
+++ src/wp-admin/css/media.css	(working copy)
@@ -432,6 +432,14 @@
 	position: relative;
 }
 
+/* See #30392. */
+.media-modal .moxie-shim.moxie-shim-html5 {
+	visibility: hidden;
+}
+.media-modal .moxie-shim.moxie-shim-html5 input[type="file"] {
+	visibility: visible;
+}
+
 /**
  * Media Library grid view
  */