[Fetch API] Abort fetching when the passed ScriptState is invalid.

third_party/WebKit/Source/modules/fetch/GlobalFetch.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 "modules/fetch/GlobalFetch.h"
 
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/UseCounter.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "modules/fetch/FetchManager.h"
@@ skipping 15 matching lines @@
         GlobalFetchImpl* supplement = static_cast<GlobalFetchImpl*>(Supplement<T>::from(supplementable, supplementName()));
         if (!supplement) {
             supplement = new GlobalFetchImpl(executionContext);
             Supplement<T>::provideTo(supplementable, supplementName(), supplement);
         }
         return supplement;
     }
 
     ScriptPromise fetch(ScriptState* scriptState, const RequestInfo& input, const Dictionary& init, ExceptionState& exceptionState) override
     {
+        if (!scriptState->contextIsValid()) {
+            // TODO(yhirano): Should this be moved to bindings?
+            exceptionState.throwTypeError("The global scope is shutting down.");
+            return ScriptPromise();
+        }
         if (m_fetchManager->isStopped()) {
             exceptionState.throwTypeError("The global scope is shutting down.");
             return ScriptPromise();
         }
 
         // "Let |r| be the associated request of the result of invoking the
         // initial value of Request as constructor with |input| and |init| as
         // arguments. If this throws an exception, reject |p| with it."
         Request* r = Request::create(scriptState, input, init, exceptionState);
         if (exceptionState.hadException())
@@ skipping 46 matching lines @@
 }
 
 ScriptPromise GlobalFetch::fetch(ScriptState* scriptState, WorkerGlobalScope& worker, const RequestInfo& input, const Dictionary& init, ExceptionState& exceptionState)
 {
     // Note that UseCounter doesn't work with SharedWorker or ServiceWorker.
     UseCounter::count(worker.getExecutionContext(), UseCounter::Fetch);
     return ScopedFetcher::from(worker)->fetch(scriptState, input, init, exceptionState);
 }
 
 } // namespace blink