[XHR] Ignore didReceiveData when having a DataConsumerHandle.

Source/core/loader/DocumentThreadableLoader.cpp

Index: Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/Source/core/loader/DocumentThreadableLoader.cpp b/Source/core/loader/DocumentThreadableLoader.cpp
index ae1d7a904da4066a0e7f741b9d8faf72fe05feca..62e9fb8df84713649ab0a804a4c409b8987e1e97 100644
--- a/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/Source/core/loader/DocumentThreadableLoader.cpp
@@ -88,6 +88,7 @@ DocumentThreadableLoader::DocumentThreadableLoader(Document& document, Threadabl
     , m_securityOrigin(m_resourceLoaderOptions.securityOrigin)
     , m_sameOriginRequest(securityOrigin()->canRequest(request.url()))
     , m_crossOriginNonSimpleRequest(false)
+    , m_isUsingDataConsumerHandle(false)
     , m_async(blockingBehavior == LoadAsynchronously)
     , m_requestContext(request.requestContext())
     , m_timeoutTimer(this, &DocumentThreadableLoader::didTimeout)
@@ -373,6 +374,9 @@ void DocumentThreadableLoader::responseReceived(Resource* resource, const Resour
     ASSERT_UNUSED(resource, resource == this->resource());
     ASSERT(m_async);
 
+    if (handle)
+        m_isUsingDataConsumerHandle = true;
+
     handleResponse(resource->identifier(), response, handle);
 }
 
@@ -465,6 +469,9 @@ void DocumentThreadableLoader::dataReceived(Resource* resource, const char* data
     ASSERT_UNUSED(resource, resource == this->resource());
     ASSERT(m_async);
 
+    if (m_isUsingDataConsumerHandle)
+        return;
+
     handleReceivedData(data, dataLength);
 }