Make ThreadableLoader class to use references

Source/core/xml/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 776 matching lines @@
             m_upload->dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::loadstart));
         }
     }
 
     m_sameOriginRequest = securityOrigin()->canRequest(m_url);
 
     // We also remember whether upload events should be allowed for this request in case the upload listeners are
     // added after the request is started.
     m_uploadEventsAllowed = m_sameOriginRequest || uploadEvents || !isSimpleCrossOriginAccessRequest(m_method, m_requestHeaders);
 
+    ASSERT(executionContext());
+    ExecutionContext& executionContext = *this->executionContext();
+
     ResourceRequest request(m_url);
     request.setHTTPMethod(m_method);
     request.setTargetType(ResourceRequest::TargetIsXHR);
 
-    InspectorInstrumentation::willLoadXHR(executionContext(), this, this, m_method, m_url, m_async, m_requestEntityBody ? m_requestEntityBody->deepCopy() : nullptr, m_requestHeaders, m_includeCredentials);
+    InspectorInstrumentation::willLoadXHR(&executionContext, this, this, m_method, m_url, m_async, m_requestEntityBody ? m_requestEntityBody->deepCopy() : nullptr, m_requestHeaders, m_includeCredentials);
 
     if (m_requestEntityBody) {
         ASSERT(m_method != "GET");
         ASSERT(m_method != "HEAD");
         request.setHTTPBody(m_requestEntityBody.release());
     }
 
     if (m_requestHeaders.size() > 0)
         request.addHTTPHeaderFields(m_requestHeaders);
 
     ThreadableLoaderOptions options;
     options.sniffContent = DoNotSniffContent;
     options.preflightPolicy = uploadEvents ? ForcePreflight : ConsiderPreflight;
     options.allowCredentials = (m_sameOriginRequest || m_includeCredentials) ? AllowStoredCredentials : DoNotAllowStoredCredentials;
     options.credentialsRequested = m_includeCredentials ? ClientRequestedCredentials : ClientDidNotRequestCredentials;
     options.crossOriginRequestPolicy = UseAccessControl;
     options.securityOrigin = securityOrigin();
     options.initiator = FetchInitiatorTypeNames::xmlhttprequest;
-    options.contentSecurityPolicyEnforcement = ContentSecurityPolicy::shouldBypassMainWorld(executionContext()) ? DoNotEnforceContentSecurityPolicy : EnforceConnectSrcDirective;
+    options.contentSecurityPolicyEnforcement = ContentSecurityPolicy::shouldBypassMainWorld(&executionContext) ? DoNotEnforceContentSecurityPolicy : EnforceConnectSrcDirective;
     // TODO(tsepez): Specify TreatAsActiveContent per http://crbug.com/305303.
     options.mixedContentBlockingTreatment = TreatAsPassiveContent;
     options.timeoutMilliseconds = m_timeoutMilliseconds;
 
     m_exceptionCode = 0;
     m_error = false;
 
     if (m_async) {
         if (m_upload)
             request.setReportUploadProgress(true);
 
         // ThreadableLoader::create can return null here, for example if we're no longer attached to a page.
         // This is true while running onunload handlers.
         // FIXME: Maybe we need to be able to send XMLHttpRequests from onunload, <http://bugs.webkit.org/show_bug.cgi?id=10904>.
         // FIXME: Maybe create() can return null for other reasons too?
         ASSERT(!m_loader);
-        m_loader = ThreadableLoader::create(executionContext(), this, request, options);
+        m_loader = ThreadableLoader::create(executionContext, this, request, options);
         if (m_loader) {
             // Neither this object nor the JavaScript wrapper should be deleted while
             // a request is in progress because we need to keep the listeners alive,
             // and they are referenced by the JavaScript wrapper.
             setPendingActivity(this);
         }
     } else {
-        ThreadableLoader::loadResourceSynchronously(executionContext(), request, *this, options);
+        ThreadableLoader::loadResourceSynchronously(executionContext, request, *this, options);
     }
 
     if (!m_exceptionCode && m_error)
         m_exceptionCode = NetworkError;
     if (m_exceptionCode)
         exceptionState.throwDOMException(m_exceptionCode, "Failed to load '" + m_url.elidedString() + "'.");
 }
 
 void XMLHttpRequest::abort()
 {
@@ skipping 536 matching lines @@
 }
 
 void XMLHttpRequest::trace(Visitor* visitor)
 {
     visitor->trace(m_responseBlob);
     visitor->trace(m_responseStream);
     visitor->trace(m_progressEventThrottle);
 }
 
 } // namespace WebCore