Make required dictionary members non-nullable again

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
index 88eeaead49e059cfffcb588ac5dc6c1eec4cfa84..75ef8c6fa3c17161511b6f24f316fe28364103a7 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
@@ -72,6 +72,15 @@ test(function() {
     assert_equals(
         new ExtendableEvent('ExtendableEvent').type,
         'ExtendableEvent', 'Type of ExtendableEvent should be ExtendableEvent');
+    assert_throws(new TypeError, function() {
+        new FetchEvent('FetchEvent');
+    }, 'FetchEvent constructor with one argument throws');
+    assert_throws(new TypeError, function() {
+        new FetchEvent('FetchEvent', {});
+    }, 'FetchEvent constructor with empty init dict throws');
+    assert_throws(new TypeError, function() {
+        new FetchEvent('FetchEvent', {request: null});
+    }, 'FetchEvent constructor with null request member throws');
     var req = new Request('https://www.example.com/', {method: 'POST'});
     assert_equals(
         new FetchEvent('FetchEvent', {request: req}).type,