Bug 1378330 - Fix the disappeared submit button in search field on Win & Linux r=dao

MozReview-Commit-ID: 6q2UbHpzqjr

--HG--
extra : rebase_source : 5374edd81335ba9fbc629676c7c91641a8dc17bc

toolkit/themes/shared/in-content/common.inc.css

@@ -491,11 +491,11 @@ xul|textbox.tree-input {
   padding-left: unset;
 }
 
-xul|textbox[type="search"] > .textbox-input-box > .textbox-search-icons > .textbox-search-icon {
+xul|textbox[type="search"]:not([searchbutton]) > .textbox-input-box > .textbox-search-icons > .textbox-search-icon {
   visibility: hidden;
 }
 
-xul|textbox[type="search"] > .textbox-input-box > .textbox-search-sign {
+xul|textbox[type="search"]:not([searchbutton]) > .textbox-input-box > .textbox-search-sign {
   list-style-image: url(chrome://global/skin/icons/search-textbox.svg);
   margin-inline-end: 5px;
 }