Switch to use net::FilterSourceStream from net::Filter

net/url_request/url_request_test_util.cc

Index: net/url_request/url_request_test_util.cc
diff --git a/net/url_request/url_request_test_util.cc b/net/url_request/url_request_test_util.cc
index 5a026d395342b32da3904ca1d8ad46d70eccc2ee..8f82bc897e5e9b77f624b607512c11ed77a036f9 100644
--- a/net/url_request/url_request_test_util.cc
+++ b/net/url_request/url_request_test_util.cc
@@ -194,6 +194,7 @@ TestDelegate::TestDelegate()
       certificate_errors_are_fatal_(false),
       auth_required_(false),
       have_full_request_headers_(false),
+      response_completed_(false),
       request_status_(ERR_IO_PENDING),
       buf_(new IOBuffer(kBufferSize)) {}
 
@@ -317,6 +318,7 @@ void TestDelegate::OnReadCompleted(URLRequest* request, int bytes_read) {
 }
 
 void TestDelegate::OnResponseCompleted(URLRequest* request) {
+  response_completed_ = true;
   if (quit_on_complete_)
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());