Fix a crash when the content type of a multipart request

webkit/glue/multipart_response_delegate.h

Index: webkit/glue/multipart_response_delegate.h
diff --git a/webkit/glue/multipart_response_delegate.h b/webkit/glue/multipart_response_delegate.h
index 268999ba0d239cc21b226e6d7289d34ea6564d44..aded54a397ea402704ca18d3946e3bfd83fcb45f 100644
--- a/webkit/glue/multipart_response_delegate.h
+++ b/webkit/glue/multipart_response_delegate.h
@@ -75,6 +75,12 @@ class MultipartResponseDelegate {
   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.