Added PermissionIDSet to APIPermissions

extensions/common/permissions/coalesced_permission_message.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/coalesced_permission_message.h"
 
 namespace extensions {
 
+CoalescedPermissionMessage::CoalescedPermissionMessage() {
+}
+
 CoalescedPermissionMessage::CoalescedPermissionMessage(
     const base::string16& message,
     const PermissionIDSet& permissions)
     : message_(message), permissions_(permissions) {
 }
 
 CoalescedPermissionMessage::CoalescedPermissionMessage(
     const base::string16& message,
     const PermissionIDSet& permissions,
     const std::vector<base::string16>& submessages)
     : message_(message), permissions_(permissions), submessages_(submessages) {
 }
 
 CoalescedPermissionMessage::~CoalescedPermissionMessage() {
 }
 
 }  // namespace extensions