[CodeHealth] Remove expired History.FirstSetTopSitesDeltaSize histogram As a part of the CodeHealthRotation, this CL removes the expired histograms. OBSOLETE_HISTOGRAM[History.FirstSetTopSitesDeltaSize]=The histogram was expired as of M77. Bug: 1499416 Change-Id: If556b18debcd6adc93a97d237c5b2263242bd33d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5043688 Reviewed-by: Sophie Chang <sophiechang@chromium.org> Commit-Queue: Minoru Chikamune <chikamune@chromium.org> Cr-Commit-Position: refs/heads/main@{#1227157}
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