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

chrome/common/extensions/api/developer_private.idl

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // developerPrivate API.
 // This is a private API exposing developing and debugging functionalities for
 // apps and extensions.
 namespace developerPrivate {
 
   enum ItemType {
@@ skipping 10 matching lines @@
 
     // For lazy background pages, the value is -1.
     long render_process_id;
 
     long render_view_id;
     boolean incognito;
     boolean generatedBackgroundPage;
   };
 
   dictionary InstallWarning {
-    boolean is_html;
     DOMString message;
   };
 
   dictionary ItemInfo {
     DOMString id;
     DOMString name;
     DOMString version;
     DOMString description;
     boolean may_disable;
     boolean enabled;
@@ skipping 167 matching lines @@
     // translated string to use in the apps_debugger app UI.
     static void getStrings(GetStringsCallback callback);
   };
 
   interface Events {
     // Fired when a item state is changed.
     static void onItemStateChanged(EventData response);
   };
 
 };