Make unknown extension subpermissions warnings instead of errors.

extensions/common/permissions/api_permission.cc

 // Copyright 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 "extensions/common/permissions/api_permission.h"
 
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
@@ skipping 29 matching lines @@
     CHECK_EQ(info(), rhs->info());
     return true;
   }
 
   virtual bool Equal(const APIPermission* rhs) const OVERRIDE {
     if (this != rhs)
       CHECK_EQ(info(), rhs->info());
     return true;
   }
 
-  virtual bool FromValue(const base::Value* value,
-                         std::string* /*error*/) OVERRIDE {
+  virtual bool FromValue(
+      const base::Value* value,
+      std::string* /*error*/,
+      std::vector<std::string>* /*unhandled_permissions*/) OVERRIDE {
     return (value == NULL);
   }
 
   virtual scoped_ptr<base::Value> ToValue() const OVERRIDE {
     return scoped_ptr<base::Value>();
   }
 
   virtual APIPermission* Clone() const OVERRIDE {
     return new SimpleAPIPermission(info());
   }
@@ skipping 70 matching lines @@
   return api_permission_constructor_ ?
     api_permission_constructor_(this) : new SimpleAPIPermission(this);
 }
 
 PermissionMessage APIPermissionInfo::GetMessage_() const {
   return PermissionMessage(
       message_id_, l10n_util::GetStringUTF16(l10n_message_id_));
 }
 
 }  // namespace extensions