fix a semi-rare crash in multibuffers

media/blink/test_response_generator.h

 // 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.
 
 #ifndef MEDIA_BLINK_TEST_RESPONSE_GENERATOR_H_
 #define MEDIA_BLINK_TEST_RESPONSE_GENERATOR_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 41 matching lines @@
   // Generates a custom HTTP 206 response starting from |first_byte_offset|
   // until |last_byte_offset|. You can tweak what gets included in the
   // headers via |flags|.
   blink::WebURLResponse GeneratePartial206(int64_t first_byte_offset,
                                            int64_t last_byte_offset,
                                            Flags flags);
 
   // Generates a regular HTTP 404 response.
   blink::WebURLResponse Generate404();
 
+  // Generate a HTTP response with specified code.
+  blink::WebURLResponse GenerateResponse(int code);
+
   // Generates a file:// response starting from |first_byte_offset| until the
   // end of the resource.
   //
   // If |first_byte_offset| is negative a response containing no content length
   // will be returned.
   blink::WebURLResponse GenerateFileResponse(int64_t first_byte_offset);
 
   int64_t content_length() { return content_length_; }
 
  private:
   GURL gurl_;
   int64_t content_length_;
 
   DISALLOW_COPY_AND_ASSIGN(TestResponseGenerator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_TEST_RESPONSE_GENERATOR_H_