Use a new Supplement constructor in Navigator supplements (part 2)

third_party/WebKit/Source/modules/webauth/NavigatorAuth.cpp

 // Copyright 2016 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.
 
 #include "modules/webauth/NavigatorAuth.h"
 
 #include "core/frame/Navigator.h"
 #include "modules/webauth/WebAuthentication.h"
 
 namespace blink {
@@ skipping 14 matching lines @@
 
 WebAuthentication* NavigatorAuth::authentication() {
   return m_webauthentication;
 }
 
 DEFINE_TRACE(NavigatorAuth) {
   visitor->trace(m_webauthentication);
   Supplement<Navigator>::trace(visitor);
 }
 
-NavigatorAuth::NavigatorAuth(Navigator& navigator) {
+NavigatorAuth::NavigatorAuth(Navigator& navigator)
+    : Supplement<Navigator>(navigator) {
   if (navigator.frame())
     m_webauthentication = WebAuthentication::create(*navigator.frame());
 }
 
 const char* NavigatorAuth::supplementName() {
   return "NavigatorAuth";
 }
 
 }  // namespace blink