Add ExtensionManagement based ExternalLoader

chrome/browser/extensions/external_policy_loader.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_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
-#include "base/prefs/pref_change_registrar.h"
+#include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/external_loader.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace extensions {
 
-// A specialization of the ExternalProvider that uses
-// pref_names::kInstallForceList to look up which external extensions are
-// registered.
-class ExternalPolicyLoader
-    : public ExternalLoader,
-      public content::NotificationObserver {
+// A specialization of the ExternalProvider that uses extension management
+// policies to look up which external extensions are registered.
+class ExternalPolicyLoader : public ExternalLoader,
+                             public ExtensionManagement::Observer {
  public:
   explicit ExternalPolicyLoader(Profile* profile);

[Joao da Silva, 2014/09/04 12:07:46]

This doesn't really need a Profile, just an ExtensionManagement* handle. Pass
that directly here instead, so that the interface clearly indicates what it uses
and tests also become simpler (no need to have a TestingProfile, just a
TestingPrefs)

[binjin, 2014/09/04 14:27:06]

Done. But I don't know how to simplify the tests: seems that initialization of
ExternalProviderImpl requires a Profile.

 
-  // content::NotificationObserver implementation
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // ExtensionManagement::Observer implementation
+  virtual void OnExtensionManagementSettingsChanged() OVERRIDE;
 
   // Adds an extension to be updated to the pref dictionary.
   static void AddExtension(base::DictionaryValue* dict,
                            const std::string& extension_id,
                            const std::string& update_url);
 
  protected:
   virtual void StartLoading() OVERRIDE;
 
  private:
   friend class base::RefCountedThreadSafe<ExternalLoader>;
 
-  virtual ~ExternalPolicyLoader() {}
+  virtual ~ExternalPolicyLoader();
 
-  PrefChangeRegistrar pref_change_registrar_;
-  content::NotificationRegistrar notification_registrar_;
-
-  Profile* profile_;
+  ExtensionManagement* settings_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalPolicyLoader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_