[Fetch] Disable no-cors in non-serviceworker

Source/modules/fetch/FetchManager.cpp

 // 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.
 
 #include "config.h"
 #include "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 152 matching lines @@
     failed("Fetch API cannot load " + error.failingURL() + ". " + error.localizedDescription());
 }
 
 void FetchManager::Loader::didFailRedirectCheck()
 {
     failed("Fetch API cannot load " + m_request->url().string() + ". Redirect failed.");
 }
 
 void FetchManager::Loader::start()
 {
+    if (!executionContext()->isServiceWorkerGlobalScope()
+        && m_request->mode() == WebURLRequest::FetchRequestModeNoCORS) {
+        performNetworkError("no-cors is disabled for non-serviceworker.");
+        return;
+    }
+
     // "1. If |request|'s url contains a Known HSTS Host, modify it per the
     // requirements of the 'URI [sic] Loading and Port Mapping' chapter of HTTP
     // Strict Transport Security."
     // FIXME: Implement this.
 
     // "2. If |request|'s referrer is not none, set |request|'s referrer to the
     // result of invoking determine |request|'s referrer."
     // We set the referrer using workerGlobalScope's URL in
     // WorkerThreadableLoader.
 
@@ skipping 247 matching lines @@
 
 DEFINE_TRACE(FetchManager)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_executionContext);
     visitor->trace(m_loaders);
 #endif
 }
 
 } // namespace blink