Deprecate direct use of legacy extension management preference

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

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.h
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.h b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
index 7cca3a32a5c4d2499154b1e16a68419f1735bbf5..1218e08443008a8bf3b6d4c889dbeeb50ff78b2e 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.h
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
@@ -10,11 +10,11 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
-#include "base/prefs/pref_change_registrar.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/extensions/error_console/error_console.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
+#include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
 #include "chrome/browser/extensions/requirements_checker.h"
 #include "content/public/browser/navigation_controller.h"
@@ -71,6 +71,7 @@ class ExtensionSettingsHandler
       public content::WebContentsObserver,
       public ErrorConsole::Observer,
       public ExtensionInstallPrompt::Delegate,
+      public ExtensionManagement::Observer,
       public ExtensionPrefsObserver,
       public ExtensionRegistryObserver,
       public ExtensionUninstallDialog::Delegate,
@@ -134,6 +135,9 @@ class ExtensionSettingsHandler
   virtual void OnExtensionDisableReasonsChanged(const std::string& extension_id,
                                                 int disable_reasons) OVERRIDE;
 
+  // ExtensionManagement::Observer implementation.
+  virtual void OnExtensionManagementSettingsChanged() OVERRIDE;
+
   // ExtensionUninstallDialog::Delegate implementation, used for receiving
   // notification about uninstall confirmation dialog selections.
   virtual void ExtensionUninstallAccepted() OVERRIDE;
@@ -276,8 +280,6 @@ class ExtensionSettingsHandler
 
   content::NotificationRegistrar registrar_;
 
-  PrefChangeRegistrar pref_registrar_;
-
   // This will not be empty when a requirements check is in progress. Doing
   // another Check() before the previous one is complete will cause the first
   // one to abort.
@@ -300,6 +302,9 @@ class ExtensionSettingsHandler
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
+  ScopedObserver<ExtensionManagement, ExtensionManagement::Observer>
+      extension_management_observer_;
+
   // Whether we found any DISABLE_NOT_VERIFIED extensions and want to kick off
   // a verification check to try and rescue them.
   bool should_do_verification_check_;