Extends the lifetime of WebRTC.DesktopCapture.FrameIsRefresh.* UMAs

Bug: 325945863
Change-Id: If894146d2cbb5d079fefb04e1e9bd19a14aae85d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5353092


Reviewed-by: Johannes Kron <kron@chromium.org>
Commit-Queue: Henrik Andreasson <henrika@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1270120}