Remove ExtensionPrefFactory's dependency on Profile.

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 2013 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/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 319 matching lines @@
       update_once_all_providers_are_ready_(false),
       browser_terminating_(false),
       installs_delayed_for_gc_(false),
       is_first_run_(false) {
 #if defined(OS_CHROMEOS)
   disable_garbage_collection_ = false;
 #endif
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Figure out if extension installation should be enabled.
-  if (command_line->HasSwitch(switches::kDisableExtensions) ||
-      profile->GetPrefs()->GetBoolean(prefs::kDisableExtensions)) {
+  if (extensions::ExtensionsBrowserClient::Get()->AreExtensionsDisabled(
+          *command_line, profile))
     extensions_enabled_ = false;
-  }
 
   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_PROCESS_TERMINATED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CREATED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
@@ skipping 2437 matching lines @@
 }
 
 void ExtensionService::AddUpdateObserver(extensions::UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void ExtensionService::RemoveUpdateObserver(
     extensions::UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }