Fix a crash when the content type of a multipart request

webkit/glue/multipart_response_delegate.h

 // Copyright (c) 2006-2009 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.
 //
 // A delegate class of WebURLLoaderImpl that handles multipart/x-mixed-replace
 // data.  We special case multipart/x-mixed-replace because WebCore expects a
 // separate didReceiveResponse for each new message part.
 //
 // Most of the logic and edge case handling are based on the Mozilla's
 // implementation in netwerk/streamconv/converters/nsMultiMixedConv.cpp.
@@ skipping 57 matching lines @@
  public:
   MultipartResponseDelegate(WebKit::WebURLLoaderClient* client,
                             WebKit::WebURLLoader* loader,
                             const WebKit::WebURLResponse& response,
                             const std::string& boundary);
 
   // Passed through from ResourceHandleInternal
   void OnReceivedData(const char* data, int data_len);
   void OnCompletedRequest();
 
+  // The request has been canceled, so stop making calls to the client.
+  void Cancel() {
+    client_ = NULL;
+    loader_ = NULL;
+  }
+
   // Returns the multi part boundary string from the Content-type header
   // in the response.
   // Returns true on success.
   static bool ReadMultipartBoundary(const WebKit::WebURLResponse& response,
                                     std::string* multipart_boundary);
 
   // Returns the lower and higher content ranges from an individual multipart
   // in a multipart response.
   // Returns true on success.
   static bool ReadContentRanges(const WebKit::WebURLResponse& response,
@@ skipping 44 matching lines @@
 
   // true after we've sent our first response to the WebURLLoaderClient.
   bool has_sent_first_response_;
 
   DISALLOW_COPY_AND_ASSIGN(MultipartResponseDelegate);
 };
 
 }  // namespace webkit_glue
 
 #endif