Make Response::body return v8-extra based stream behind flag

third_party/WebKit/Source/modules/fetch/RequestTest.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/Request.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/Document.h"
 #include "core/frame/Frame.h"
@@ skipping 60 matching lines @@
     const WebURLRequest::FetchRequestMode mode = WebURLRequest::FetchRequestModeNavigate;
 
     webRequest.setURL(url);
     webRequest.setMethod(method);
     webRequest.setRequestContext(context);
     webRequest.setMode(mode);
     for (int i = 0; headers[i].key; ++i)
         webRequest.setHeader(WebString::fromUTF8(headers[i].key), WebString::fromUTF8(headers[i].value));
     webRequest.setReferrer(referrer, referrerPolicy);
 
-    Request* request = Request::create(getExecutionContext(), webRequest);
+    Request* request = Request::create(getScriptState(), webRequest);
     ASSERT(request);
     EXPECT_EQ(url, request->url());
     EXPECT_EQ(method, request->method());
     EXPECT_EQ("audio", request->context());
     EXPECT_EQ(referrer, request->referrer());
     EXPECT_EQ("navigate", request->mode());
 
     Headers* requestHeaders = request->getHeaders();
 
     WTF::HashMap<String, String> headersMap;
@@ skipping 25 matching lines @@
     Request* request = Request::create(getScriptState(), url, exceptionState);
     ASSERT(request);
 
     WebServiceWorkerRequest webRequest;
     request->populateWebServiceWorkerRequest(webRequest);
     EXPECT_EQ(urlWithoutFragment, KURL(webRequest.url()));
 }
 
 } // namespace
 } // namespace blink