You can 'svnsync' data from Google code to a local repository on your computer. Then you can use 'svnadmin' to create the dump file and send it to your new hosting provider, or in some cases you can use svnsync to upload to the repository.
The only public hosting that I know that supports svnsync download is Google code (you need to clear the repository first), which most likely will not help you, but now there may be others.
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