Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/credentialmanager/PasswordCredential.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.
 
+typedef (FormData or URLSearchParams) CredentialBodyType;
+
 [
     RuntimeEnabled=CredentialManager,
     RaisesException=Constructor,
-    Constructor(DOMString id, DOMString password, optional DOMString name, optional DOMString iconURL)
+    Constructor(PasswordCredentialData data),
+    Exposed=Window,
 ] interface PasswordCredential : Credential {
-    readonly attribute DOMString password;
-    readonly attribute FormData formData;
+    attribute USVString idName;
+    attribute USVString passwordName;
+    attribute CredentialBodyType? additionalData;
 };