Fix Polymer licensing issues

third_party/polymer/v1_0/components/promise-polyfill/Gruntfile.js

-module.exports = function(grunt) {
-
-        grunt.initConfig({
-                pkg: grunt.file.readJSON('package.json'),
-
-                uglify: {
-                        options: {
-                                banner: '/*! <%= pkg.name %> <%= pkg.version %> */\n'
-                        },
-                        dist: {
-                                files: {
-                                        'Promise.min.uglify.js': ['Promise.js']
-                                }
-                        }
-                },
-
-    closurecompiler: {
-      options: {
-        compilation_level: 'ADVANCED_OPTIMIZATIONS',
-      },
-      dist: {
-        files: {
-          'Promise.min.js': ['Promise.js']
-        }
-      }
-    },
-
-    bytesize: {
-      dist: {
-        src: ['Promise*.js']
-      }
-    }
-        });
-
-        grunt.loadNpmTasks('grunt-contrib-uglify');
-        grunt.loadNpmTasks('grunt-closurecompiler');
-        grunt.loadNpmTasks('grunt-bytesize');
-
-        grunt.registerTask('build', ['closurecompiler', 'bytesize']);
-};