Add a warning when developing an extension that uses old manifest version.

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/extensions/extension_settings_handler.h"
 
 #include "base/auto_reset.h"
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 169 matching lines @@
            ++iter) {
         string16 warning_string(
             ExtensionWarningSet::GetLocalizedWarning(*iter));
         warnings_list->Append(Value::CreateStringValue(warning_string));
       }
       extension_data->Set("warnings", warnings_list);
     }
   }
 
   // Add install warnings (these are not the same as warnings!).
-  const std::vector<std::string>& install_warnings =
+  const Extension::InstallWarningVector& install_warnings =
       extension->install_warnings();
   if (!install_warnings.empty()) {
     scoped_ptr<ListValue> list(new ListValue());
-    for (std::vector<std::string>::const_iterator it = install_warnings.begin();
-         it != install_warnings.end(); ++it) {
-      list->Append(Value::CreateStringValue(*it));
+    for (Extension::InstallWarningVector::const_iterator it =
+             install_warnings.begin(); it != install_warnings.end(); ++it) {
+      DictionaryValue* item = new DictionaryValue();
+      item->SetBoolean("isHTML",
+                       it->format == Extension::InstallWarning::FORMAT_HTML);
+      item->SetString("message", it->message);
+      list->Append(item);
     }
     extension_data->Set("installWarnings", list.release());
   }
 
   return extension_data;
 }
 
 void ExtensionSettingsHandler::GetLocalizedValues(
     DictionaryValue* localized_strings) {
   localized_strings->SetString("extensionSettings",
@@ skipping 639 matching lines @@
   return extension_uninstall_dialog_.get();
 #else
   return NULL;
 #endif  // !defined(OS_ANDROID)
 }
 
 void ExtensionSettingsHandler::InspectExtensionHost(ExtensionHost* host) {
   if (host)
     DevToolsWindow::OpenDevToolsWindow(host->render_view_host());
 }