Fixes the `jasmine.Matchers.not` extern to have the proper non-nullable type.
@@ -124,7 +124,7 @@ jasmine.AsyncMatchers.prototype.withContext = function(message) {};
jasmine.Matchers = function() {};
-/** @type {jasmine.Matchers} */
+/** @type {!jasmine.Matchers} */
jasmine.Matchers.prototype.not;
