Fix deprecation message

lib/runtime/dart/math.js

 dart_library.library('dart/math', null, /* Imports */[
   'dart/_runtime',
   'dart/core'
 ], /* Lazy imports */[
   'dart/_js_helper'
 ], function(exports, dart, core, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   class _JenkinsSmiHash extends core.Object {
     static combine(hash, value) {
@@ skipping 25 matching lines @@
   const Point$ = dart.generic(function(T) {
     class Point extends core.Object {
       Point(x, y) {
         this.x = x;
         this.y = y;
       }
       toString() {
         return `Point(${this.x}, ${this.y})`;
       }
       ['=='](other) {
-        if (!dart.is(other, Point$())) return false;
+        if (!dart.is(other, Point$(core.num))) return false;

[Jennifer Messerly, 2016/03/08 00:21:31]

Hmm, so we now convert `other is Point` to `other is Point<num>`. I think that
should be fine, because you can't create a `Point<dynamic>`. But it's a bit
interesting :)

         return dart.equals(this.x, dart.dload(other, 'x')) && dart.equals(this.y, dart.dload(other, 'y'));
       }
       get hashCode() {
         return _JenkinsSmiHash.hash2(dart.hashCode(this.x), dart.hashCode(this.y));
       }
       ['+'](other) {
         dart.as(other, Point$(T));
         return new (Point$(T))(dart.notNull(this.x) + dart.notNull(other.x), dart.notNull(this.y) + dart.notNull(other.y));
       }
       ['-'](other) {
@@ skipping 486 matching lines @@
   exports.sin = sin;
   exports.cos = cos;
   exports.tan = tan;
   exports.acos = acos;
   exports.asin = asin;
   exports.atan = atan;
   exports.sqrt = sqrt;
   exports.exp = exp;
   exports.log = log;
 });