Move ExtensionPrefs and friends to extensions/ directory.

chrome/browser/extensions/extension_system_factory.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_system_factory.h"
 
-#include "chrome/browser/extensions/extension_prefs_factory.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/policy/profile_policy_connector_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/global_error/global_error_service_factory.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
+#include "extensions/browser/extension_prefs_factory.h"
 #include "extensions/browser/extension_registry_factory.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 namespace extensions {
 
 // ExtensionSystemSharedFactory
 
 // static
 ExtensionSystemImpl::Shared*
 ExtensionSystemSharedFactory::GetForProfile(Profile* profile) {
@@ skipping 69 matching lines @@
     content::BrowserContext* context) const {
   // Separate instance in incognito.
   return context;
 }
 
 bool ExtensionSystemFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 }  // namespace extensions