The SignedCertificateTimestampStore is left over from the days when Chrome had an SCT viewer UI on some platforms, but SCTs are no longer ever retrieved from it and it just wastes memory.
It might makes sense to show SCT details in the DevTools security panel ( issue 591848 ), but for that we can probably just send the relevant details to DevTools along with requests, rather than storing the details in the browser process as long as the renderer process is alive.
Comment 1 by est...@chromium.org
, Mar 7 2016