Use downloadToFile option when XHR downloads a Blob

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 4cb4aa5b3785eaf2b2fc695d92e79c2881f20c7d..a878b1e8292222f41b26e54772ca0f9566b632d0 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -1186,6 +1186,15 @@ void ResourceFetcher::didReceiveData(const Resource* resource, const char* data,
     InspectorInstrumentation::didReceiveResourceData(cookie);
 }
 
+void ResourceFetcher::didDownloadData(const Resource* resource, int dataLength, int encodedDataLength, const ResourceLoaderOptions& options)
+{
+    InspectorInstrumentationCookie cookie = InspectorInstrumentation::willReceiveResourceData(frame(), resource->identifier(), encodedDataLength);
+    if (options.sendLoadCallbacks != SendCallbacks)
+        return;
+    context().dispatchDidDownloadData(m_documentLoader, resource->identifier(), dataLength, encodedDataLength);
+    InspectorInstrumentation::didReceiveResourceData(cookie);
+}
+
 void ResourceFetcher::subresourceLoaderFinishedLoadingOnePart(ResourceLoader* loader)
 {
     if (m_multipartLoaders)