Fix a crash when the content type of a multipart request

webkit/glue/weburlloader_impl.cc

 // 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.
 
 // An implementation of WebURLLoader in terms of ResourceLoaderBridge.
 
 #include "webkit/glue/weburlloader_impl.h"
 
 #include "base/file_path.h"
 #include "base/message_loop.h"
@@ skipping 252 matching lines @@
 }
 
 void WebURLLoaderImpl::Context::Cancel() {
   // The bridge will still send OnCompletedRequest, which will Release() us, so
   // we don't do that here.
   if (bridge_.get())
     bridge_->Cancel();
 
   // Ensure that we do not notify the multipart delegate anymore as it has
   // its own pointer to the client.
-  multipart_delegate_.reset();
+  if (multipart_delegate_.get())
+    multipart_delegate_->Cancel();
 
   // Do not make any further calls to the client.
   client_ = NULL;
   loader_ = NULL;
 }
 
 void WebURLLoaderImpl::Context::SetDefersLoading(bool value) {
   if (bridge_.get())
     bridge_->SetDefersLoading(value);
 }
@@ skipping 366 matching lines @@
 
 void WebURLLoaderImpl::cancel() {
   context_->Cancel();
 }
 
 void WebURLLoaderImpl::setDefersLoading(bool value) {
   context_->SetDefersLoading(value);
 }
 
 }  // namespace webkit_glue