Handle should.throw() assertion with no argument properly

third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html

Index: third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html
diff --git a/third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html b/third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html
index 73a034f63f7e84c0775759f9a0b40df73faea35b..1624a684aa348ba6af402eb916c3a40e9fca5874 100644
--- a/third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html
+++ b/third_party/WebKit/LayoutTests/webaudio/unit-tests/audit.html
@@ -16,8 +16,9 @@
       task.describe('Simple unit tests for basic assertions.');
 
       should(OfflineAudioContext, 'OfflineAudioContext').exist();
-      should(function () { var foo = 0; }, 'Setting foo to 0').notThrow();
-      should(function () { var foo = bar; }).throw('ReferenceError');
+      should(function () { var foo1 = 0; }, 'Setting foo1 to 0').notThrow();
+      should(function () { var foo2 = bar; }).throw();
+      should(function () { var foo3 = bar; }).throw('ReferenceError');
       should(3 < 5, '3 < 5').beTrue();
       should(false).beFalse();
       should(1).beEqualTo(1)