[Telemetry] Remove Page.TransferToPageSet method.
This method is never used. It was introduced as a way to conveniently share pages among page sets. The implementation
is not correct as archive_data_file is defined in page_set.
In the future, sharing pages among pageset should be simple
when we can remove the page's dependence on pageset (https://code.google.com/p/chromium/issues/detail?id=466836)
Review URL: https://codereview.chromium.org/
1033493003
Cr-Commit-Position: refs/heads/master@{#322661}