[Fetch API] Remove DrainingBuffer.

Source/modules/cachestorage/Cache.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/cachestorage/Cache.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 536 matching lines @@
         if (requests[i]->hasBody() && requests[i]->bodyUsed()) {
             barrierCallback->onError("Request body is already used");
             return promise;
         }
         if (responses[i]->hasBody() && responses[i]->bodyUsed()) {
             barrierCallback->onError("Response body is already used");
             return promise;
         }
 
         if (requests[i]->hasBody())
-            requests[i]->lockBody(Body::PassBody);
+            requests[i]->setBodyPassed();
         if (responses[i]->hasBody())
-            responses[i]->lockBody(Body::PassBody);
+            responses[i]->setBodyPassed();
 
-        if (OwnPtr<DrainingBodyStreamBuffer> buffer = responses[i]->createInternalDrainingStream()) {
+        BodyStreamBuffer* buffer = responses[i]->internalBodyBuffer();
+        if (buffer->hasBody()) {
             // If the response has body, read the all data and create
             // the blob handle and dispatch the put batch asynchronously.
             FetchDataLoader* loader = FetchDataLoader::createLoaderAsBlobHandle(responses[i]->internalMIMEType());
-            buffer->startLoading(loader, new BlobHandleCallbackForPut(i, barrierCallback, requests[i], responses[i]));
+            buffer->startLoading(scriptState->executionContext(), loader, new BlobHandleCallbackForPut(i, barrierCallback, requests[i], responses[i]));
             continue;
         }
 
         WebServiceWorkerCache::BatchOperation batchOperation;
         batchOperation.operationType = WebServiceWorkerCache::OperationTypePut;
         requests[i]->populateWebServiceWorkerRequest(batchOperation.request);
         responses[i]->populateWebServiceWorkerResponse(batchOperation.response);
         barrierCallback->onSuccess(i, batchOperation);
     }
 
@@ skipping 18 matching lines @@
     m_webCache->dispatchKeys(new CacheWithRequestsCallbacks(resolver), 0, toWebQueryParams(options));
     return promise;
 }
 
 WebServiceWorkerCache* Cache::webCache() const
 {
     return m_webCache.get();
 }
 
 } // namespace blink