Fix some lingering WebUI focus issues.

chrome/browser/resources/extensions/extension_commands_overlay.js

Index: chrome/browser/resources/extensions/extension_commands_overlay.js
diff --git a/chrome/browser/resources/extensions/extension_commands_overlay.js b/chrome/browser/resources/extensions/extension_commands_overlay.js
index ab56eb4e1719d0ef3a5c43d1ebc754ff27abc07d..9b51f341f90fc764d2f789ad9de6f40fc5a399e3 100644
--- a/chrome/browser/resources/extensions/extension_commands_overlay.js
+++ b/chrome/browser/resources/extensions/extension_commands_overlay.js
@@ -34,8 +34,9 @@ cr.define('extensions', function() {
       this.extensionCommandList_ = new ExtensionCommandList(
           /**@type {HTMLDivElement} */($('extension-command-list')));
 
-      $('extension-commands-dismiss').addEventListener('click',
-          this.handleDismiss_.bind(this));
+      $('extension-commands-dismiss').addEventListener('click', function() {
+        cr.dispatchSimpleEvent(overlay, 'cancelOverlay');
+      });
 
       // The ExtensionList will update us with its data, so we don't need to
       // handle that here.