remove no longer necessary mapping service

frontend/app/components/api/api-experimental/api-param-mapping.service.ts

@@ -1,49 +0,0 @@
-// -- copyright
-// OpenProject is a project management system.
-// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License version 3.
-//
-// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
-// Copyright (C) 2006-2013 Jean-Philippe Lang
-// Copyright (C) 2010-2013 the ChiliProject Team
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-//
-// See doc/COPYRIGHT.rdoc for more details.
-// ++
-
-export class ApiParamMappingService {
-
-  //TODO: Add missing properties.
-  protected static propertyMap = {
-    assigned_to: 'assignee',
-    updated_at: 'updatedAt'
-  };
-
-  public static columnListToV3(columns: any[]) {
-    columns.forEach(column => column.name = ApiParamMappingService.columnToV3(column));
-    return columns;
-  }
-
-  public static columnToV3(column: any) {
-    return ApiParamMappingService.propertyMap[column.name] || column.name;
-  }
-}
-
-angular
-  .module('openproject.api')
-  .service('ApiParamMappingService', ApiParamMappingService);

frontend/app/components/query/query-service.service.ts

@@ -27,7 +27,6 @@
 // ++
 
 function QueryService(Query,
-                      ApiParamMappingService,
                       $http,
                       PathHelper,
                       $q,
@@ -198,10 +197,7 @@ function QueryService(Query,
 
       var url = projectIdentifier ? PathHelper.apiProjectAvailableColumnsPath(projectIdentifier) : PathHelper.apiAvailableColumnsPath();
 
-      return QueryService.doGet(url, function(response){
-        availableColumns = ApiParamMappingService.constructor.columnListToV3(response.data.available_columns);
-        return availableColumns;
-      });
+      return QueryService.doGet(url, (response) => response.data.available_columns);
     },
 
     getGroupBy: function() {