Extensions: Remove PermissionMessage (permission_message.h/cc)

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 "extensions/common/permissions/api_permission_set.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
 using extensions::APIPermission;
 using extensions::APIPermissionInfo;
-using extensions::PermissionMessage;
-using extensions::PermissionMessages;
 
 class SimpleAPIPermission : public APIPermission {
  public:
   explicit SimpleAPIPermission(const APIPermissionInfo* permission)
     : APIPermission(permission) { }
 
   ~SimpleAPIPermission() override {}
 
   extensions::PermissionIDSet GetPermissions() const override {
     extensions::PermissionIDSet permissions;
@@ skipping 85 matching lines @@
 }
 
 APIPermissionInfo::~APIPermissionInfo() { }
 
 APIPermission* APIPermissionInfo::CreateAPIPermission() const {
   return api_permission_constructor_ ?
     api_permission_constructor_(this) : new SimpleAPIPermission(this);
 }
 
 }  // namespace extensions