Replace chrome::NOTIFICATION_EXTENSION_WARNING_CHANGED message with observer pattern

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_SETTINGS_HANDLER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/api/prefs/pref_change_registrar.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
+#include "chrome/browser/extensions/extension_warning_set.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_ui_message_handler.h"
 #include "googleurl/src/gurl.h"
 #include "ui/base/dialogs/select_file_dialog.h"
 
 class ExtensionService;
 class FilePath;
 class PrefService;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace extensions {
 class Extension;
 class ExtensionHost;
-class ExtensionWarningService;
 class ManagementPolicy;
 }
 
 // Information about a page running in an extension, for example a popup bubble,
 // a background page, or a tab contents.
 struct ExtensionPage {
   ExtensionPage(const GURL& url, int render_process_id, int render_view_id,
                 bool incognito)
       : url(url),
         render_process_id(render_process_id),
         render_view_id(render_view_id),
         incognito(incognito) {}
   GURL url;
   int render_process_id;
   int render_view_id;
   bool incognito;
 };
 
 // Extension Settings UI handler.
-class ExtensionSettingsHandler : public content::WebUIMessageHandler,
-                                 public content::NotificationObserver,
-                                 public content::WebContentsObserver,
-                                 public ui::SelectFileDialog::Listener,
-                                 public ExtensionUninstallDialog::Delegate {
+class ExtensionSettingsHandler
+    : public content::WebUIMessageHandler,
+      public content::NotificationObserver,
+      public content::WebContentsObserver,
+      public ui::SelectFileDialog::Listener,
+      public ExtensionUninstallDialog::Delegate,
+      public extensions::ExtensionWarningService::Observer {
  public:
   ExtensionSettingsHandler();
   virtual ~ExtensionSettingsHandler();
 
   static void RegisterUserPrefs(PrefService* prefs);
 
   // Extension Detail JSON Struct for page. |pages| is injected for unit
   // testing.
   // Note: |warning_set| can be NULL in unit tests.
   base::DictionaryValue* CreateExtensionDetailValue(
@@ skipping 29 matching lines @@
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // ExtensionUninstallDialog::Delegate implementation, used for receiving
   // notification about uninstall confirmation dialog selections.
   virtual void ExtensionUninstallAccepted() OVERRIDE;
   virtual void ExtensionUninstallCanceled() OVERRIDE;
 
+  // extensions::ExtensionWarningService::Observer implementation.
+  virtual void ExtensionWarningsChanged() OVERRIDE;
+
   // Helper method that reloads all unpacked extensions.
   void ReloadUnpackedExtensions();
 
   // Callback for "requestExtensionsData" message.
   void HandleRequestExtensionsData(const base::ListValue* args);
 
   // Callback for "toggleDeveloperMode" message.
   void HandleToggleDeveloperMode(const base::ListValue* args);
 
   // Callback for "inspect" message.
@@ skipping 92 matching lines @@
 
   content::NotificationRegistrar registrar_;
 
   PrefChangeRegistrar pref_registrar_;
   PrefChangeRegistrar local_state_pref_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_EXTENSIONS_EXTENSION_SETTINGS_HANDLER_H_