fix a semi-rare crash in multibuffers

media/blink/test_response_generator.cc

Index: media/blink/test_response_generator.cc
diff --git a/media/blink/test_response_generator.cc b/media/blink/test_response_generator.cc
index 7079f9e13486480019f1becd3a06723cf92119ab..487aab3d44ae06719fb58179592d5816a4d5a4d1 100644
--- a/media/blink/test_response_generator.cc
+++ b/media/blink/test_response_generator.cc
@@ -88,12 +88,16 @@ WebURLResponse TestResponseGenerator::GeneratePartial206(
   return response;
 }
 
-WebURLResponse TestResponseGenerator::Generate404() {
+WebURLResponse TestResponseGenerator::GenerateResponse(int code) {
   WebURLResponse response(gurl_);
-  response.setHTTPStatusCode(404);
+  response.setHTTPStatusCode(code);
   return response;
 }
 
+WebURLResponse TestResponseGenerator::Generate404() {
+  return GenerateResponse(404);
+}
+
 WebURLResponse TestResponseGenerator::GenerateFileResponse(
     int64_t first_byte_offset) {
   WebURLResponse response(gurl_);