Revert of Make initEvent's first argument non-optional

third_party/WebKit/LayoutTests/external/wpt/dom/events/Event-initEvent-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/dom/events/Event-initEvent-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/dom/events/Event-initEvent-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/dom/events/Event-initEvent-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..742badeebf788aae290bedd30f8e67d1d32c4a66
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/dom/events/Event-initEvent-expected.txt
@@ -0,0 +1,17 @@
+This is a testharness.js-based test.
+PASS Properties of initEvent(type, true, true) 
+PASS Properties of initEvent(type, true, false) 
+PASS Properties of initEvent(type, false, true) 
+PASS Properties of initEvent(type, false, false) 
+PASS Calling initEvent multiple times (getting type). 
+PASS Calling initEvent multiple times (not getting type). 
+PASS Calling initEvent must not have an effect during dispatching. 
+PASS Calling initEvent must unset the stop propagation flag. 
+PASS Calling initEvent must unset the stop immediate propagation flag. 
+PASS Calling initEvent during propagation. 
+FAIL First parameter to initEvent should be mandatory. assert_throws: function "function () {
+    e.initEvent()
+  }" did not throw
+PASS Tests initEvent's default parameter values. 
+Harness: the test ran to completion.
+