Allow extensions on chrome:// URLs, when flag is set and permission is explicitly requested

chrome/browser/extensions/extension_prefs.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_prefs.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_notifier.h"
 #include "base/prefs/pref_service.h"
 #include "base/string_util.h"
@@ skipping 540 matching lines @@
   // Retrieve the explicit host permissions.
   URLPatternSet explicit_hosts;
   ReadExtensionPrefURLPatternSet(
       extension_id, JoinPrefs(pref_key, kPrefExplicitHosts),
       &explicit_hosts, Extension::kValidHostPermissionSchemes);
 
   // Retrieve the scriptable host permissions.
   URLPatternSet scriptable_hosts;
   ReadExtensionPrefURLPatternSet(
       extension_id, JoinPrefs(pref_key, kPrefScriptableHosts),
-      &scriptable_hosts, UserScript::kValidUserScriptSchemes);
+      &scriptable_hosts, UserScript::ValidUserScriptSchemes());
 
   return new PermissionSet(apis, explicit_hosts, scriptable_hosts);
 }
 
 void ExtensionPrefs::SetExtensionPrefPermissionSet(
     const std::string& extension_id,
     const std::string& pref_key,
     const PermissionSet* new_value) {
   // Set the API permissions.
   // The format of api_values is:
@@ skipping 1824 matching lines @@
     is_enabled = initial_state == Extension::ENABLED;
   }
 
   extension_pref_value_map_->RegisterExtension(extension_id, install_time,
                                                is_enabled);
   content_settings_store_->RegisterExtension(extension_id, install_time,
                                              is_enabled);
 }
 
 }  // namespace extensions