Remove ShadowDOMV1 runtime flag (status=stable)

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

Index: third_party/WebKit/Source/core/events/Event.idl
diff --git a/third_party/WebKit/Source/core/events/Event.idl b/third_party/WebKit/Source/core/events/Event.idl
index 82bd377fa19cda3096ef57f02af6efba1f170536..4a7a7c9daf0b0928261cad4ac45615f8b271f150 100644
--- a/third_party/WebKit/Source/core/events/Event.idl
+++ b/third_party/WebKit/Source/core/events/Event.idl
@@ -27,7 +27,7 @@
     readonly attribute DOMString type;
     readonly attribute EventTarget? target;
     readonly attribute EventTarget? currentTarget;
-    [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposedPath, CallWith=ScriptState] sequence<EventTarget> composedPath();
+    [MeasureAs=EventComposedPath, CallWith=ScriptState] sequence<EventTarget> composedPath();
 
     const unsigned short NONE = 0;
     const unsigned short CAPTURING_PHASE = 1;
@@ -43,7 +43,7 @@
     void preventDefault();
     readonly attribute boolean defaultPrevented;
 
-    [RuntimeEnabled=ShadowDOMV1, MeasureAs=EventComposed] readonly attribute boolean composed;
+    [MeasureAs=EventComposed] readonly attribute boolean composed;
 
     [Unforgeable] readonly attribute boolean isTrusted;