Use a new Supplement constructor for (Worker)Navigator supplements

third_party/WebKit/Source/modules/mediastream/NavigatorUserMedia.cpp

 // Copyright 2015 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/mediastream/NavigatorUserMedia.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "modules/mediastream/MediaDevices.h"
 
 namespace blink {
 
-NavigatorUserMedia::NavigatorUserMedia(ExecutionContext* context)
-    : m_mediaDevices(MediaDevices::create(context)) {}
+NavigatorUserMedia::NavigatorUserMedia(Navigator& navigator)
+    : Supplement<Navigator>(navigator),
+      m_mediaDevices(MediaDevices::create(
+          navigator.frame() ? navigator.frame()->document() : nullptr)) {}
 
 const char* NavigatorUserMedia::supplementName() {
   return "NavigatorUserMedia";
 }
 
 NavigatorUserMedia& NavigatorUserMedia::from(Navigator& navigator) {
   NavigatorUserMedia* supplement = static_cast<NavigatorUserMedia*>(
       Supplement<Navigator>::from(navigator, supplementName()));
   if (!supplement) {
-    ExecutionContext* context =
-        navigator.frame() ? navigator.frame()->document() : nullptr;
-    supplement = new NavigatorUserMedia(context);
+    supplement = new NavigatorUserMedia(navigator);
     provideTo(navigator, supplementName(), supplement);
   }
   return *supplement;
 }
 
 MediaDevices* NavigatorUserMedia::getMediaDevices() {
   return m_mediaDevices;
 }
 
 MediaDevices* NavigatorUserMedia::mediaDevices(Navigator& navigator) {
   return NavigatorUserMedia::from(navigator).getMediaDevices();
 }
 
 DEFINE_TRACE(NavigatorUserMedia) {
   visitor->trace(m_mediaDevices);
   Supplement<Navigator>::trace(visitor);
 }
 
 }  // namespace blink