Add a "key" entry to InstallWarnings, remove InstallWarning::Format

chrome/browser/resources/apps_debugger/js/items_list.js

Index: chrome/browser/resources/apps_debugger/js/items_list.js
diff --git a/chrome/browser/resources/apps_debugger/js/items_list.js b/chrome/browser/resources/apps_debugger/js/items_list.js
index 489fa9d792c50ac20fc70d1e72f8c4bd2a491341..8c67d36dcff009ceba26745b840810f37afb1c11 100644
--- a/chrome/browser/resources/apps_debugger/js/items_list.js
+++ b/chrome/browser/resources/apps_debugger/js/items_list.js
@@ -287,7 +287,7 @@ cr.define('apps_dev_tool', function() {
         var list = panel.querySelector('ul');
         item.install_warnings.forEach(function(warning) {
           var li = document.createElement('li');
-          li[warning.isHTML ? 'innerHTML' : 'textContent'] = warning.message;
+          li.textContent = warning.message;
           list.appendChild(li);
         });
       }