Revert of [WebUI] Tweak action-link's .no-outline removal behavior on blur.

ui/webui/resources/js/action_link.js

Index: ui/webui/resources/js/action_link.js
diff --git a/ui/webui/resources/js/action_link.js b/ui/webui/resources/js/action_link.js
index 9d83ed727a749c6549186c6b12f6d46ce2448ce7..a9e1ffd6620991b44b5a6aa4a790bd93da9c62eb 100644
--- a/ui/webui/resources/js/action_link.js
+++ b/ui/webui/resources/js/action_link.js
@@ -75,10 +75,8 @@
           this.classList.add('no-outline');
       });
 
-      this.addEventListener('blur', function(e) {
-        // This check helps us exclude external events like application switch.
-        if (e.sourceCapabilities)
-          this.classList.remove('no-outline');
+      this.addEventListener('blur', function() {
+        this.classList.remove('no-outline');
       });
     },