[Fetch API] Reflect spec changes of bodyUsed property

third_party/WebKit/Source/modules/fetch/FetchResponseData.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/FetchResponseData.h"
 
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/fetch/CrossOriginAccessControl.h"
 #include "modules/fetch/BodyStreamBuffer.h"
@@ skipping 165 matching lines @@
         ASSERT(m_buffer == m_internalResponse->m_buffer);
         ASSERT(m_internalResponse->m_type == DefaultType);
         newResponse->m_internalResponse = m_internalResponse->clone(executionContext);
         m_buffer = m_internalResponse->m_buffer;
         newResponse->m_buffer = newResponse->m_internalResponse->m_buffer;
         break;
     case DefaultType: {
         ASSERT(!m_internalResponse);
         if (m_buffer) {
             OwnPtr<WebDataConsumerHandle> handle1, handle2;
-            // TODO(yhirano): unlock the buffer appropriately.
-            DataConsumerTee::create(executionContext, m_buffer->lock(executionContext), &handle1, &handle2);
+            DataConsumerTee::create(executionContext, m_buffer->releaseHandle(executionContext), &handle1, &handle2);
             m_buffer = new BodyStreamBuffer(createFetchDataConsumerHandleFromWebHandle(handle1.release()));
             newResponse->m_buffer = new BodyStreamBuffer(createFetchDataConsumerHandleFromWebHandle(handle2.release()));
         }
         break;
     }
     case ErrorType:
         ASSERT(!m_internalResponse);
         ASSERT(!m_buffer);
         break;
     case OpaqueType:
@@ skipping 46 matching lines @@
 }
 
 DEFINE_TRACE(FetchResponseData)
 {
     visitor->trace(m_headerList);
     visitor->trace(m_internalResponse);
     visitor->trace(m_buffer);
 }
 
 } // namespace blink