Remove //chrome dependency from ExtensionPrefs

chrome/browser/extensions/test_extension_system.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/test_extension_system.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/blacklist.h"
 #include "chrome/browser/extensions/error_console/error_console.h"
@@ skipping 55 matching lines @@
   // Note that the GetPrefs() creates a TestingPrefService, therefore
   // the extension controlled pref values set in ExtensionPrefs
   // are not reflected in the pref service. One would need to
   // inject a new ExtensionPrefStore(extension_pref_value_map, false).
 
   ExtensionPrefs* extension_prefs = ExtensionPrefs::Create(
       profile_->GetPrefs(),
       install_directory,
       ExtensionPrefValueMapFactory::GetForBrowserContext(profile_),
       ExtensionsBrowserClient::Get()->CreateAppSorting().Pass(),
-      extensions_disabled);
+      extensions_disabled,
+      std::vector<ExtensionPrefsObserver*>());
     ExtensionPrefsFactory::GetInstance()->SetInstanceForTesting(
         profile_,
         extension_prefs);
     return extension_prefs;
 }
 
 ExtensionService* TestExtensionSystem::CreateExtensionService(
     const CommandLine* command_line,
     const base::FilePath& install_directory,
     bool autoupdate_enabled) {
@@ skipping 94 matching lines @@
 const OneShotEvent& TestExtensionSystem::ready() const {
   return ready_;
 }
 
 // static
 KeyedService* TestExtensionSystem::Build(content::BrowserContext* profile) {
   return new TestExtensionSystem(static_cast<Profile*>(profile));
 }
 
 }  // namespace extensions