Don't initialize event when calling create() with no argument

third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt
index 66de6f4bbcbdaa49c89f8d2b20c4233f293592f7..12abdf78e46b10aa629120bed6e7f872b21cacc0 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt
+++ b/third_party/WebKit/LayoutTests/external/wpt/dom/events/EventTarget-dispatchEvent-expected.txt
@@ -2,8 +2,8 @@ CONSOLE ERROR: line 60: Uncaught Error
 This is a testharness.js-based test.
 PASS Calling dispatchEvent(null). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (AnimationEvent). 
-FAIL If the event's initialized flag is not set, an InvalidStateError must be thrown (BeforeUnloadEvent). assert_equals: Event type should be empty string before initialization expected "" but got "beforeunload"
-FAIL If the event's initialized flag is not set, an InvalidStateError must be thrown (CloseEvent). assert_equals: Event type should be empty string before initialization expected "" but got "close"
+PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (BeforeUnloadEvent). 
+PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (CloseEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (CompositionEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (CustomEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (DeviceMotionEvent). 
@@ -21,7 +21,7 @@ PASS If the event's initialized flag is not set, an InvalidStateError must be th
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (MouseEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (MouseEvents). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (PageTransitionEvent). 
-FAIL If the event's initialized flag is not set, an InvalidStateError must be thrown (PopStateEvent). assert_equals: Event type should be empty string before initialization expected "" but got "popstate"
+PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (PopStateEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (ProgressEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (StorageEvent). 
 PASS If the event's initialized flag is not set, an InvalidStateError must be thrown (SVGEvents).