WebUI: Add JavaScript lifecycle-control to WebUIMessageHandler.

chrome/browser/ui/webui/settings/settings_startup_pages_handler.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/custom_home_pages_table_model.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
@@ skipping 12 matching lines @@
 
 // Chrome browser startup settings handler.
 class StartupPagesHandler : public SettingsPageUIHandler,
                             public ui::TableModelObserver {
  public:
   explicit StartupPagesHandler(content::WebUI* webui);
   ~StartupPagesHandler() override;
 
   // SettingsPageUIHandler:
   void RegisterMessages() override;
-  void RenderViewReused() override;
+  void OnJavascriptAllowed() override;
+  void OnJavascriptDisallowed() override;
 
   // ui::TableModelObserver:
   void OnModelChanged() override;
   void OnItemsChanged(int start, int length) override;
   void OnItemsAdded(int start, int length) override;
   void OnItemsRemoved(int start, int length) override;
 
  private:
   // Adds a startup page with the given URL after the given index.
   void HandleAddStartupPage(const base::ListValue* args);
@@ skipping 27 matching lines @@
 
   // The set of pages to launch on startup.
   CustomHomePagesTableModel startup_custom_pages_table_model_;
 
   DISALLOW_COPY_AND_ASSIGN(StartupPagesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_STARTUP_PAGES_HANDLER_H_