Use event init dictionaries in modules/{notifications,push_messaging,serviceworkers}

Source/modules/push_messaging/PushEventInit.idl

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/push-api/#idl-def-PushEvent
+
+dictionary PushEventInit : ExtendableEventInit {
+    // FIXME: This should be PushMessageDataInit, which is a typedef of USVString
+    // https://w3c.github.io/push-api/#idl-def-PushMessageData

[Peter Beverloo, 2014/12/05 15:48:33]

Could you remove this FIXME? The spec is wrong and mvanouwerkerk still has to
update it :-).

[bashi, 2014/12/08 23:39:29]

Done. Thank you for the clarification :)

+    PushMessageData data;
+};