Use a new Supplement constructor for (Worker)Navigator supplements

third_party/WebKit/Source/modules/mediasession/NavigatorMediaSession.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/mediasession/NavigatorMediaSession.h"
 
 #include "bindings/core/v8/ScriptState.h"
 #include "modules/mediasession/MediaSession.h"
 #include "platform/Supplementable.h"
 
 namespace blink {
 
-NavigatorMediaSession::NavigatorMediaSession(Navigator&) {}
+NavigatorMediaSession::NavigatorMediaSession(Navigator& navigator)
+    : Supplement<Navigator>(navigator) {}
 
 DEFINE_TRACE(NavigatorMediaSession) {
   visitor->trace(m_session);
   Supplement<Navigator>::trace(visitor);
 }
 
 const char* NavigatorMediaSession::supplementName() {
   return "NavigatorMediaSession";
 }
 
 NavigatorMediaSession& NavigatorMediaSession::from(Navigator& navigator) {
   NavigatorMediaSession* supplement = static_cast<NavigatorMediaSession*>(
       Supplement<Navigator>::from(navigator, supplementName()));
   if (!supplement) {
     supplement = new NavigatorMediaSession(navigator);
     provideTo(navigator, supplementName(), supplement);
   }
   return *supplement;
 }
 
 MediaSession* NavigatorMediaSession::mediaSession(ScriptState* scriptState,
                                                   Navigator& navigator) {
   NavigatorMediaSession& self = NavigatorMediaSession::from(navigator);
   if (!self.m_session)
     self.m_session = MediaSession::create(scriptState->getExecutionContext());
   return self.m_session.get();
 }
 
 }  // namespace blink