Fix a crash of SRI when used with web workers

third_party/WebKit/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 "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ThrowException.h"
@@ skipping 197 matching lines @@
         }
       }
       if (r == WebDataConsumerHandle::ShouldWait)
         return;
       String errorMessage =
           "Unknown error occurred while trying to verify integrity.";
       m_finished = true;
       if (r == WebDataConsumerHandle::Done) {
         if (SubresourceIntegrity::CheckSubresourceIntegrity(
                 m_integrityMetadata, m_buffer.data(), m_buffer.size(), m_url,
-                *m_loader->document(), errorMessage)) {
+                *m_loader->executionContext(), errorMessage)) {
           m_updater->update(
               new FormDataBytesConsumer(m_buffer.data(), m_buffer.size()));
           m_loader->m_resolver->resolve(m_response);
           m_loader->m_resolver.clear();
           // FetchManager::Loader::didFinishLoading() can
           // be called before didGetReadable() is called
           // when the data is ready. In that case,
           // didFinishLoading() doesn't clean up and call
           // notifyFinished(), so it is necessary to
           // explicitly finish the loader here.
@@ skipping 36 matching lines @@
          FetchRequestData*,
          bool isIsolatedWorld);
 
   void performBasicFetch();
   void performNetworkError(const String& message);
   void performHTTPFetch(bool corsFlag, bool corsPreflightFlag);
   void performDataFetch();
   void failed(const String& message);
   void notifyFinished();
   Document* document() const;
+  ExecutionContext* executionContext() { return m_executionContext; }
   void loadSucceeded();
 
   Member<FetchManager> m_fetchManager;
   Member<ScriptPromiseResolver> m_resolver;
   Member<FetchRequestData> m_request;
   Member<ThreadableLoader> m_loader;
   bool m_failed;
   bool m_finished;
   int m_responseHttpStatusCode;
   Member<SRIVerifier> m_integrityVerifier;
@@ skipping 646 matching lines @@
   m_loaders.remove(loader);
   loader->dispose();
 }
 
 DEFINE_TRACE(FetchManager) {
   visitor->trace(m_loaders);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink