The current behaviour in dev tools network monitor is missing data for
the `Transferred` size and `Content` size.
We currently have a fn `response_content` that constructs the
`ResponseContentMsg` struct where the two missing data fields are
defined and set to zero values.
These current changes calculates the data in the `response_content` fn
and sends a `NetworkEvent::HttpResponse` to the client when the final
body is done.
Currently, we have data appearing in the `Transferred` column of the
network panel
fixes: https://github.com/servo/servo/issues/38126
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Signed-off-by: uthmaniv <uthmanyahayababa@gmail.com>
a27715a5a8