Make unknown extension subpermissions warnings instead of errors.

extensions/common/permissions/settings_override_permission.cc

 // Copyright 2014 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 "extensions/common/permissions/settings_override_permission.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ skipping 46 matching lines @@
   CHECK_EQ(info(), rhs->info());
   return true;
 }
 
 bool SettingsOverrideAPIPermission::Equal(const APIPermission* rhs) const {
   if (this != rhs)
     CHECK_EQ(info(), rhs->info());
   return true;
 }
 
-bool SettingsOverrideAPIPermission::FromValue(const base::Value* value,
-                                              std::string* /*error*/) {
+bool SettingsOverrideAPIPermission::FromValue(
+    const base::Value* value,
+    std::string* /*error*/,
+    std::vector<std::string>* unhandled_permissions) {
   return (value == NULL);
 }
 
 scoped_ptr<base::Value> SettingsOverrideAPIPermission::ToValue() const {
   return scoped_ptr<base::Value>();
 }
 
 APIPermission* SettingsOverrideAPIPermission::Clone() const {
   return new SettingsOverrideAPIPermission(info(), setting_value_);
 }
@@ skipping 19 matching lines @@
 void SettingsOverrideAPIPermission::Write(IPC::Message* m) const {}
 
 bool SettingsOverrideAPIPermission::Read(const IPC::Message* m,
                                          PickleIterator* iter) {
   return true;
 }
 
 void SettingsOverrideAPIPermission::Log(std::string* log) const {}
 
 }  // namespace extensions