[WebUI] Modify action-link's .no-outline on input only.

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..e5a991821bfc93ceb3d56b343b6bf92cc0971f91 100644
--- a/ui/webui/resources/js/action_link.js
+++ b/ui/webui/resources/js/action_link.js
@@ -54,6 +54,12 @@ var ActionLink = document.registerElement('action-link', {
         }
       });
 
+      this.addEventListener('keyup', function(e) {
+        // If focus started via Tab press, allow outline to show.
+        if (e.key === 'Tab')

[Dan Beam, 2017/03/22 03:28:53]

this isn't the only way focus can get to an element.  enter and screenreaders
with configurable shortcuts also can set focus

+          this.classList.remove('no-outline');
+      });
+
       function preventDefault(e) {
         e.preventDefault();
       }
@@ -70,16 +76,10 @@ var ActionLink = document.registerElement('action-link', {
         document.addEventListener('selectstart', preventDefault);
         document.addEventListener('mouseup', removePreventDefault);
 
-        // If focus started via mouse press, don't show an outline.
+        // If focus started via mouse press, suppress outline.
         if (document.activeElement != this)
           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');
-      });
     },
 
     /** @type {boolean} */