Make [TypeChecking=Interface] the default

third_party/WebKit/Source/core/events/UIEvent.idl

Index: third_party/WebKit/Source/core/events/UIEvent.idl
diff --git a/third_party/WebKit/Source/core/events/UIEvent.idl b/third_party/WebKit/Source/core/events/UIEvent.idl
index c0ae319c56a15118ab96b46878e5b1bd4dd7b988..714b0360ffa1bce70d76211cbbc85a14bffee174 100644
--- a/third_party/WebKit/Source/core/events/UIEvent.idl
+++ b/third_party/WebKit/Source/core/events/UIEvent.idl
@@ -28,11 +28,11 @@
 
     // https://w3c.github.io/uievents/#idl-interface-UIEvent-initializers
     // TODO(philipj): None of the initUIEvent() arguments should be optional.
-    [Measure] void initUIEvent([Default=Undefined] optional DOMString type,
-                               [Default=Undefined] optional boolean bubbles,
-                               [Default=Undefined] optional boolean cancelable,
-                               [Default=Undefined] optional Window? view,
-                               [Default=Undefined] optional long detail);
+    [Measure, LegacyInterfaceTypeChecking] void initUIEvent([Default=Undefined] optional DOMString type,
+                                                            [Default=Undefined] optional boolean bubbles,
+                                                            [Default=Undefined] optional boolean cancelable,
+                                                            [Default=Undefined] optional Window? view,
+                                                            [Default=Undefined] optional long detail);
 
     // FIXME: this belongs on the KeyboardEvent interface
     [MeasureAs=UIEventWhich] readonly attribute long which;