[Fetch API] Remove DrainingBuffer.

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 "config.h"
 #include "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 103 matching lines @@
             break;
         case WebURLRequest::FetchRequestModeNoCORS:
             m_request->setResponseTainting(FetchRequestData::OpaqueTainting);
             break;
         case WebURLRequest::FetchRequestModeCORS:
         case WebURLRequest::FetchRequestModeCORSWithForcedPreflight:
             m_request->setResponseTainting(FetchRequestData::CORSTainting);
             break;
         }
     }
-    FetchResponseData* responseData = FetchResponseData::createWithBuffer(BodyStreamBuffer::create(createFetchDataConsumerHandleFromWebHandle(handle)));
+    FetchResponseData* responseData = FetchResponseData::createWithBuffer(new BodyStreamBuffer(createFetchDataConsumerHandleFromWebHandle(handle)));
     responseData->setStatus(response.httpStatusCode());
     responseData->setStatusMessage(response.httpStatusText());
     for (auto& it : response.httpHeaderFields())
         responseData->headerList()->append(it.key, it.value);
     responseData->setURL(response.url());
     responseData->setMIMEType(response.mimeType());
 
     FetchResponseData* taintedResponse = responseData;
     switch (m_request->tainting()) {
     case FetchRequestData::BasicTainting:
@@ skipping 185 matching lines @@
     ResourceRequest request(m_request->url());
     request.setRequestContext(m_request->context());
     request.setHTTPMethod(m_request->method());
     const Vector<OwnPtr<FetchHeaderList::Header>>& list = m_request->headerList()->list();
     for (size_t i = 0; i < list.size(); ++i) {
         request.addHTTPHeaderField(AtomicString(list[i]->first), AtomicString(list[i]->second));
     }
 
     if (m_request->method() != "GET" && m_request->method() != "HEAD") {
         if (BodyStreamBuffer* buffer = m_request->buffer()) {
-            RefPtr<BlobDataHandle> blobDataHandle = buffer->handle()->obtainReader(nullptr)->drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::AllowBlobWithInvalidSize);
+            RefPtr<BlobDataHandle> blobDataHandle = buffer->drainAsBlobDataHandle(FetchDataConsumerHandle::Reader::AllowBlobWithInvalidSize);
             RefPtr<FormData> httpBody(FormData::create());
             if (blobDataHandle)
                 httpBody->appendBlob(blobDataHandle->uuid(), blobDataHandle);
             request.setHTTPBody(httpBody);
         }
     }
 
     request.setUseStreamOnResponse(true);
 
     // "2. Append `Referer`/empty byte sequence, if |HTTPRequest|'s |referrer|
@@ skipping 113 matching lines @@
 
 DEFINE_TRACE(FetchManager)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_executionContext);
     visitor->trace(m_loaders);
 #endif
 }
 
 } // namespace blink