Update metadata_dispatcher.js to check for SharedWorkerGlobalScope only

chrome/browser/resources/file_manager/js/metadata/metadata_dispatcher.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 // All of these scripts could be imported with a single call to importScripts,
 // but then load and compile time errors would all be reported from the same
 // line.
 importScripts('metadata_parser.js');
@@ skipping 196 matching lines @@
   ];
 
   nextStep();
 };
 
 // Webworker spec says that the worker global object is called self.  That's
 // a terrible name since we use it all over the chrome codebase to capture
 // the 'this' keyword in lambdas.
 var global = self;
 
-// TODO(cdumez): Remove support for SharedWorkerContext name after Blink is
-// rolled.
-if (global.constructor.name == 'SharedWorkerContext' ||
-    global.constructor.name == 'SharedWorkerGlobalScope') {
+if (global.constructor.name == 'SharedWorkerGlobalScope') {
   global.addEventListener('connect', function(e) {
     var port = e.ports[0];
     new MetadataDispatcher(port);
     port.start();
   });
 } else {
   // Non-shared worker.
   new MetadataDispatcher(global);
 }