[Presentation API] make PresentationReceiver API consistent with latest spec

third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl

Index: third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl b/third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl
index 32226f7e734a4c499d5a63d3a25db6ddc63ad197..09472c982106c6ec9e542779a5d043a70a9e9247 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl
+++ b/third_party/WebKit/Source/modules/presentation/PresentationReceiver.idl
@@ -2,13 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://w3c.github.io/presentation-api/#interface-presentation
+// https://w3c.github.io/presentation-api/#idl-def-presentationreceiver
 
 [
     RuntimeEnabled=PresentationReceiver
-] interface PresentationReceiver : EventTarget {
-    [CallWith=ScriptState] Promise<PresentationConnection> getConnection();
-    [CallWith=ScriptState] Promise<sequence<PresentationConnection>> getConnections();
-
-    attribute EventHandler onconnectionavailable;
+] interface PresentationReceiver {
+    [SameObject, CallWith=ScriptState] readonly attribute Promise<PresentationConnectionList> connectionList;
 };