Bug 1567714 - Fix .urlbar-display text color on themes. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D42744

--HG--
extra : moz-landing-system : lando

browser/themes/linux/browser.css

@@ -210,10 +210,7 @@ menuitem.bookmark-item {
 }
 
 .urlbar-display {
-  margin-top: 0;
-  margin-bottom: 0;
   margin-inline-start: 0;
-  color: GrayText;
 }
 
 #search-container {

browser/themes/osx/browser.css

@@ -293,12 +293,6 @@
   max-width: 20em;
 }
 
-.urlbar-display {
-  margin-top: 0;
-  margin-bottom: 0;
-  color: GrayText;
-}
-
 #pageAction-urlbar-shareURL,
 #pageAction-panel-shareURL {
   list-style-image: url("chrome://browser/skin/share.svg");

browser/themes/shared/urlbar-searchbar.inc.css

@@ -358,6 +358,19 @@
   -moz-outline-radius: var(--toolbarbutton-border-radius);
 }
 
+.urlbar-display {
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+.urlbar-display:not(:-moz-lwtheme) {
+  color: GrayText;
+}
+
+.urlbar-display:-moz-lwtheme {
+  opacity: 0.5;
+}
+
 #urlbar-go-button,
 .search-go-button {
   list-style-image: url("chrome://browser/skin/forward.svg");

browser/themes/windows/browser.css

@@ -579,10 +579,7 @@ menuitem.bookmark-item {
 }
 
 .urlbar-display {
-  margin-top: 0;
-  margin-bottom: 0;
   margin-inline-start: 0;
-  color: GrayText;
 }
 
 #pageAction-urlbar-shareURL,