Bug 1586239 - Stop calling _addTextContentWithHighlights for the tip button. r=adw

Differential Revision: https://phabricator.services.mozilla.com/D49440

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

browser/components/urlbar/UrlbarView.jsm

@@ -832,11 +832,7 @@ class UrlbarView {
     if (result.type == UrlbarUtils.RESULT_TYPE.TIP) {
       this._addTextContentWithHighlights(title, result.payload.text, []);
       let tipButton = item._elements.get("tipButton");
-      this._addTextContentWithHighlights(
-        tipButton,
-        result.payload.buttonText,
-        []
-      );
+      tipButton.textContent = result.payload.buttonText;
       // Tips are dissimilar to other types of results and don't need the rest
       // of this markup. We return early.
       return;