{Request, Response}.blob() should release its lock when resolved.

Source/modules/fetch/Body.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/Body.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 351 matching lines @@
     case ResponseAsBlob:
         if (blobHandle->size() != kuint64max) {
             // If the size of |blobHandle| is set correctly, creates Blob from
             // it.
             if (blobHandle->type() != mimeType()) {
                 // A new BlobDataHandle is created to override the Blob's type.
                 m_resolver->resolve(Blob::create(BlobDataHandle::create(blobHandle->uuid(), mimeType(), blobHandle->size())));
             } else {
                 m_resolver->resolve(Blob::create(blobHandle));
             }
+            m_stream->close();
             m_resolver.clear();
             return;
         }
         // If the size is not set, read as ArrayBuffer and create a new blob to
         // get the size.
         // FIXME: This workaround is not good for performance.
         // When we will stop using Blob as a base system of Body to support
         // stream, this problem should be solved.
         readType = FileReaderLoader::ReadAsArrayBuffer;
         break;
@@ skipping 205 matching lines @@
 void Body::didBlobHandleReceiveError(PassRefPtrWillBeRawPtr<DOMException> exception)
 {
     if (!m_resolver)
         return;
     m_streamSource->error();
     m_resolver->reject(exception);
     m_resolver.clear();
 }
 
 } // namespace blink