DevTools: one line fix in inspect.js

BUG=

Review URL: https://codereview.chromium.org/344863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278827 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/inspect/inspect.js

@@ -665,7 +665,7 @@ function unsetModal(dialog) {
     if (dialog.tabIndexes[i] === null)
       node.removeAttribute('tabindex');
     else
-      node.setAttribute('tabindex', tabIndexes[i]);
+      node.setAttribute('tabindex', dialog.tabIndexes[i]);
   }
 
   if (window.holdDevices) {