fix a semi-rare crash in multibuffers

media/blink/test_response_generator.cc

 // Copyright 2013 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 "media/blink/test_response_generator.h"
 
 #include "base/format_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/net_errors.h"
@@ skipping 70 matching lines @@
 
   if ((flags & kNoContentLength) == 0) {
     response.setHTTPHeaderField(
         WebString::fromUTF8("Content-Length"),
         WebString::fromUTF8(base::Int64ToString(range_content_length)));
     response.setExpectedContentLength(range_content_length);
   }
   return response;
 }
 
+WebURLResponse TestResponseGenerator::GenerateResponse(int code) {
+  WebURLResponse response(gurl_);
+  response.setHTTPStatusCode(code);
+  return response;
+}
+
 WebURLResponse TestResponseGenerator::Generate404() {
-  WebURLResponse response(gurl_);
-  response.setHTTPStatusCode(404);
-  return response;
+  return GenerateResponse(404);
 }
 
 WebURLResponse TestResponseGenerator::GenerateFileResponse(
     int64_t first_byte_offset) {
   WebURLResponse response(gurl_);
   response.setHTTPStatusCode(0);
 
   if (first_byte_offset >= 0) {
     response.setExpectedContentLength(content_length_ - first_byte_offset);
   } else {
     response.setExpectedContentLength(-1);
   }
   return response;
 }
 
 }  // namespace media