WebUI: Add JavaScript lifecycle-control to WebUIMessageHandler.

chrome/browser/ui/webui/md_downloads/md_downloads_dom_handler_unittest.cc

 // Copyright 2016 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/md_downloads/md_downloads_dom_handler.h"
 
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/mock_download_manager.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/public/test/test_web_ui.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(MdDownloadsDOMHandlerTest, ChecksForRemovedFiles) {
   content::TestBrowserThreadBundle thread_bundle;
   TestingProfile profile;
 
   testing::NiceMock<content::MockDownloadManager> manager;
   ON_CALL(manager, GetBrowserContext()).WillByDefault(
       testing::Return(&profile));
 
   content::TestWebUI web_ui;
 
   EXPECT_CALL(manager, CheckForHistoryFilesRemoval());
   MdDownloadsDOMHandler handler(&manager, &web_ui);
 
   testing::Mock::VerifyAndClear(&manager);
 
   EXPECT_CALL(manager, CheckForHistoryFilesRemoval());
-  handler.RenderViewReused();
+  handler.OnJavascriptDisallowed();
 }